Research

First I will describe my current research, then my earlier research, and finally some research related activities.

At the end of this page you can find my publications.

 

 

1.Current research

My current research at the University of Groningen is on Complexity Management of Information Systems in Organizations. This design- and application-oriented research falls within SOM (which stands for Systems, Organization, and Management), the research school in which our faculty participates. My research can be explained as follows. Today’s software systems offer such complex definition and transaction mechanisms that the effect of their interactions in case of composite, integrated applications in practical situations can hardly be grasped in all their consequences, unless these sharp (and hence dangerous) “knives” are used in a structured and disciplined manner (as also explained in [31]). From a business point of view this confronts user organizations with the challenge of managing the complexity of their enterprise information systems, including their (often implicit) process models. Therefore, my central research theme is how we can control the (strongly increasing) complexity of (cooperating) information systems in (and between) organizations and communities. The research program wants to clarify the nature of this complexity and draw up practically applicable design criteria for complex software systems, including the structured use of these advanced definition and transaction mechanisms (see o.a. [36]). Specific research themes are: operations on database universes (cf. [35]), dynamic integrity constraints (cf. [37] and [41]), transactions (cf. [40], [42], and [62]), meta data (see BioGRID below), (federation) views [50], active databases, triggers, trigger generators, and information and application integration, in particular in federated information systems (cf. [45], [49], [52], [55], and [56]).

As an example, the research topic of transactions concentrates on formal, declarative definitions of transactions, which can be very complex in practice; see [42], [40], and Chapter 7 of [30]. Inspired by various practical cases we are looking for generally applicable notions and notations in order to manage the complexity of such declarative specifications of transactions. Application areas are databases and workflow environments.

I am also involved in business intelligence, datawarehouses, and datamining [34], databases in the Web [39], (spatio-) temporal databases [58], business modeling, and E-business (cf. [47], [48], [54], [57], [60], and [61]).

Since 2002, I am involved in bio-informatics, in particular in research databases for genomics, transcriptomics, micro array experiments, etc.. We successfully designed, developed (actually: generated), and implemented such a database, MolGenIS, for the Molecular Genetics group of the University of Groningen; for a demo-version of MolGenIS see http://molgen70.biol.rug.nl/molgenis_demo (use username "guest" and password "guest"). See also [53]. We are now developing similar systems for various interested life science research groups in other domains, cf. [63] and [66]. As a spin-off, we wanted to start a bioinformatics company. We successfully applied for a considerable start-up grant (from the Dutch Biopartner program). Since 2002 I participated in the EU-project BioGRID (http://www.bio-grid.net), for instance working on its meta data model. I am coauthor of several internal BioGRID documents.

Together with prof. Hillege of the University Medical Center Groningen I am leading workpackage WP3.2 of the Escher-project of the Dutch Top Institute Pharma. WP3.2 consists of the PhD project of Gert van Valkenhoef on ‘ New approaches to evidence synthesis for drug benefit-risk assessment’ (see [65]) and of a software project in which the underlying software is developed, in an agile way (see http://drugis.org and [64]).

I am also supervising the PhD project of Jelle de Boer on E-learning (see [67]).

 

2.Earlier research

Formalization of databases and classification of integrity constraints, static as well as dynamic, were my first research topics, which started with [1], [2], and [3]. Later treatments are in [8], [18], [30], [37], and [41]. E.g., [30] includes a systematic classification of static integrity constraints and [41] of dynamic integrity constraints.

The books [18] and [30] contain a nontrivial database universe (a hospital case) with a wide variety of integrity constraints. From 1987 until 1990 this “functional benchmark” was used at a number of conferences (see [12]), to test various database management systems for their possibilities to define and maintain integrity constraints (and hence to retain the quality of the data in the database). The Databaseclub of the NGI (Dutch Informatics Society) started the conference series in The Netherlands with [11] and [14]. The well-known database-experts Ted Codd and Chris Date then asked us to repeat the benchmark and to present the results at the international Codd & Date conference in 1988 in London, cf. [15]. In 1989 a subsequent two day conference was held in Berlin, where 16 well-known database management systems were involved, cf. [19]. The last report in this series was [23]. I was very closely involved in the design, preparation, and execution of these functional benchmarks.

My earlier research interests included mathematical logic and mathematical linguistics, as far as they were relevant for computing science. My main research topics in the area of mathematical logic were abstract proof systems (cf. [4]), complete axiomatizations (cf. [4]), and typed modal logical languages (cf. [5]). These topics play a role in expert systems/knowledge bases, the theory of database dependencies, and the design of manipulation languages for databases, respectively.

My research interest in mathematical linguistics concerned some topics with applications in information systems, for instance generalized quantifiers (which play a role in the case of retrieval by means of natural and conceptual languages, such as in [5]) and the so-called projection problem for presuppositions (which is important in case of queries that contain presuppositions).

My dissertation ([5]) was dedicated to database models and retrieval languages. In Part I various mathematical database models are defined, at conceptual level as well as at internal level. Part II of [5] addresses retrieval languages for databases. Three classes of retrieval languages for databases are specified, namely a class of conceptual retrieval languages (aiding our theoretical foundations), a class of imperative retrieval languages (implementation oriented), and finally a class of natural language fragments, of the English language in this case (user oriented). In order to be able to implement the natural language fragments and the conceptual retrieval languages, [5] also presents translation functions from the natural language fragments (or 5GL’s) to the conceptual retrieval languages (or 4GL’s) and from the conceptual retrieval languages to the imperative languages (or 3GL’s) mentioned before. Moreover, my dissertation gives a semantics for the database operations in these imperative languages in terms of the internal model introduced in Chapter 2.

The theory on database models that I developed has been applied frequently and successfully in practice, ranging from external assignments from clients (see for instance [9] and [10] or the complex cases [27] and [29]), via problems of colleagues from other faculties (cf. [25] and [53]), to many student assignments in practical situations. For that purpose, Chapter 9 of [30] presents concrete translation schemes from the theory into SQL(2).

 

At Philips Research I also wrote some internal technical reports, which were not public, however. In order to give an impression of the kind of research I worked on, I mention some topics: a parallel object oriented algorithm for geometric databases, an implementation of parameterized views (in behalf of a generic workflow management system), graph algorithms in 4GL extensions of SQL (finally leading to [33], [36], and [51]), and trigger generators for the database management system Sybase.

I was also a member of the working group “Integration of knowledge and data” within the PRISMA project (PaRallel Inference and Storage Machine), a joint project of Philips Research, the Dutch Centre for Mathematics and Computer Science (CWI) and some universities. In this period we wrote [17] and I also built up intensive “hands on” experience with functional programming environments (LCF, ML).

 

At the UoG (University of Groningen) I was supervisor of the PhD project of M.A. Swertz on ‘Dynamic software infrastructures for the life sciences’, together with prof. Jansen. It led to a dissertation in February 2008 at the faculty of Mathematics and Natural Sciences.

At the Eindhoven University of Technology I was the “co-supervisor” of two PhD projects. The PhD project of F.T.A.M. Pieper investigated the possibility of simulating one sort of data machine by means of other sorts of data machines using formally defined interfaces. It led to a dissertation in April 1989 at the faculty of Mathematics and Computing Science (supervisors prof. Peremans and prof. De Swart). The PhD project of H.J. Pels addressed the decomposition of a data model of an organization into submodels, based on existing authorities for changing the contents of the database. It led to a dissertation in October 1988 at the faculty of Management and Organization (supervisors prof. Wortmann and prof. Van Hee).

At the UoG I was involved as “co-supervisor” in a PhD project on the design of modular information architectures for flexible order acceptance (in engineer-to-order environments). Supervisors were prof. Simons and prof. Wijngaard. The progress of the research after one year was such that we decided not to continue the research.

Furthermore, I was a reader in the PhD committees of F. Put in December 1988 at the Catholic University of Leuven in Belgium (supervisor prof. Vandenbulcke), of R.J. Veldwijk in March 1993 at the Free University of Amsterdam (supervisor prof. Holtgrefe), of J.H. Oldenkamp in October 1996 and of J. van den Broek in January 2001, both at the UoG (supervisor prof. Simons), of L. Wedemeijer in September 2002 at the Delft University of Technology (supervisor prof. Gerhardt), and of G. Blaauw in May 2005 (supervisor prof. Boersma) and of J.A. Sassenburg in January 2006 (supervisor prof. Berghout), both at the UoG.

 

3.Research related activities

From April 1995 until June 1999 I have been a member of the editorial board of the Dutch journal Informatie. In this context I have been the editor of the special sections on Databases (January 1996), Embedded Systems (July/August 1996), Datamining (September 1997), and Datamodeling (March 1998). These editorships are not separately mentioned in my publication list.

Also, I was a member of the program committee and of the organizing committee of the conference DEMM2000 (Database Evolution and Meta Modeling), which was held in September 2000 in Dagstuhl, Germany (cf. [44]). An other activity to be mentioned was the organization of the national Database Day in November 1996 in Groningen.

As a researcher I gave several talks of course (although I did not keep track of these standard activities in a systematic way). On an ad hoc basis I have been a referee for some journals, e.g., Information Systems, Academy of Management Learning & Education, and Computers in Industry, some conferences, e.g., ECIS and the Dutch EIS, and a reviewer of some books, e.g., the well-known book Management Information Systems of Laudon & Laudon (see the inside of the book cover). On several occasions I have been a referee and advisor of GRONICS, the international IT congress of and for (graduating) students that has been held yearly at the UoG.

Finally, I note that I am appointed as research fellow within our research school SOM mentioned earlier, and as (personal) associate research fellow of the Dutch research school SIKS, on Information and Knowledge Systems.

 

Appendix: Stack of publications, reports, etc.

[67] J. de Boer, P.A.M. Kommers, and E.O. de Brock: Using learning styles and viewing styles in streaming video. Computers & Education, vol. 56 (3), 2011, pp. 727-735

        See http://dx.doi.org/10.1016/j.compedu.2010.10.015    (abstract)

[66]M.A. Swertz, M. Dijkstra, T. Adamusiak, J.K. van der Velde, A. Kanterakis, E.T. Roos, J. Lops, G.A. Thorisson, D. Arends, G. Byelas, J. Muilu, A.J. Brookes, E.O. de Brock, R.C. Jansen, and H. Parkinson:

        The MOLGENIS toolkit: rapid prototyping of biosoftware at the push of a button. BMC Bioinformatics 2010, vol. 11 (Suppl 12). See http://genomebiology.com/content/pdf/gb-2010-11-3-r27.pdf  [PDF]    (full paper)

[65] T.P. Tervonen, E.O. de Brock, P.A. de Graeff, and H.L. Hillege:

        Current status and future perspectives on drug information systems. In Proceedings of the 18th European conference on information systems (ECIS2010), Pretoria, South Africa, 2010

        See http://web.up.ac.za/ecis/ECIS2010PR/ECIS2010/Content/Papers/0004.R1.pdf [PDF]    (full paper)

[64] G. van Valkenhoef, T.P. Tervonen, E.O. de Brock, and D. Postmus:

        Product and release planning practices for extreme programming. In A. Sillitti et al. (eds.): Agile Processes in Software Engineering and Extreme Programming (XP2010) , Trondheim, Springer, LNBIP, vol. 48, Part 2, 2010, pp. 238-243. See http://www.springerlink.com/content/k8265757t7131225    (abstract)

[63]M.A. Swertz, K.J. van der Velde, B.M. Tesson, R.A. Scheltema, D. Arends, G. Vera, R. Alberts, M. Dijkstra, P. Schofield, K. Schughart, J.M. Hancock, D. Smedley, K. Wolstencroft, C. Goble, E.O. de Brock, A.R. Jones, H.E. Parkinson, members of the Coordination of Mouse Informatics Resources (CASIMIR), Genotype-To-Phenotype (GEN2PHEN) Consortiums, and R.C. Jansen: XGAP: a uniform and extensible data model and software platform for genotype and phenotype experiments. Genome Biology 2010, vol. 11 (3), R27

        See http://www.biomedcentral.com/content/pdf/1471-2105-11-S12-S12.pdf  [PDF]    (full paper)

[62] E.O. de Brock: Transactions in ORM. I n: T. Halpin et al. (eds.): BPMDS 2009 and EMMSAD 2009, Springer, Heidelberg, LNBIP, vol. 29, 2009, pp. 291-301

        See http://www.springerlink.com/content/978-3-642-01861-9/#section=31337&page=1&locus=0    (abstract)

[61] E.O. de Brock and A. Boonstra: Supporting the creation of business re-engineering ideas.

        Business Process Management Journal, vol. 14 (3), 2008, pp. 307-326

        See http://www.emeraldinsight.com/journals.htm?articleid=1732657    (abstract)

[60]A. Boonstra and E.O. de Brock: Identifying e-business options.

        In M. Khosrow-Pour (ed.): Encyclopedia of E-Commerce, E-Government, and Mobile Commerce,

        Idea Group Publishing, Hershey (PA), 2006, pp. 580-586

        See http://www.igi-global.com/bookstore/chapter.aspx?titleid=12597    (abstract)

[59]M.A. Swertz and E.O. de Brock:

        Functional design of the TCC Metabase, a meta database for controlled distribution of clinical trial databases.

        Specification report for the Trial Coordination Center, Groningen, 2005; 25 pages

[58]E.O. de Brock: Operations on (ordered) interval sets.

        SOM Research Report 04A23, University of Groningen, 2004; 30 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/themeA/2004/04A23/04A23.pdf [PDF]    (full paper)

[57]A. Boonstra and E.O. de Brock: Automated brainstorming about communication channels.

        Informatie, December 2004, pp. 22-26 (in Dutch). See http://www.informatie.nl/Artikelen/2004/december/Geautomatiseerdbrainstormenovercommunicatiekanalen.aspx   (abstract)

[56] H. Balsters and E.O. de Brock:

        Integration of Integrity Constraints in Federated Schemata Based on Tight Constraining .

        In R. Meersman and Z. Tari (eds.): On the Move to Meaningful Internet Systems ,

        Lecture Notes in Computer Science 3290, Springer Verlag, Berlin, 2004, pp. 748-767

        See http://www.springerlink.com/index/P7YALYJU184CNN39    (abstract)

[55] H. Balsters and E.O. de Brock:

        An Object-Oriented Framework for Reconciliation and Extraction in Heterogeneous Data Federations .

        In T. Yakhno (ed.): Proceedings of the Int. Conf. on Advances in Information Systems ,

        Lecture Notes in Computer Science 3261, Springer Verlag, Berlin, 2004, pp. 34-46

        See http://www.springerlink.com/index/QNDYA2EF9KRPLEK3    (abstract)

[54]E.O. de Brock: Via Choice to Opportunity: Decision Support for Generating, Ordering, Assessing, and Selecting (E-)Business Options for an Organization.

        In A. Valstar and M.J.I.M. van Genuchten (eds.): 50 years of Information Systems 1978-2028, Eindhoven University of Technology, 2004, pp. 551-563 (in Dutch)

[53] M.A. Swertz, E.O. de Brock et al.: Molecular Genetics Information System (MOLGENIS): Alternatives in Developing Local Experimental Genomics Databases . Bioinformatics, vol. 20 (13), 2004, pp. 2075-2083

        See http://bioinformatics.oupjournals.org/cgi/reprint/bth206v1.pdf [PDF]    (full paper)

[52] H. Balsters and E.O. de Brock: Integration of Integrity Constraints in Database Federations.

        In S. Jajodia and L. Strous (eds.): Integrity and Internal Control in Information Systems,

        Kluwer, Boston, 2004, pp. 143-158

        See http://www.springerlink.com/content/cn3u17651461gq28    (abstract)

[51] E.O. de Brock: Teaching Structured Design of Network Algorithms in Enhanced Versions of SQL.

        Journal of Information Technology Education, vol. 3, 2004, pp. 1-17

        See http://www.jite.org/documents/Vol3/v3p001-017-065.pdf [PDF]    (full paper)

[50] H. Balsters and E.O. de Brock: Federation Views as a Basis for Querying and Updating Database Federations.

        SOM Research Report 03A34, University of Groningen, 2003; 26 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/themeA/2003/03A34/03a34.pdf  [PDF]    (full paper)

[49] H. Balsters and E.O. de Brock: An Object-Oriented Framework for Managing Cooperating Legacy Databases.

        In D. Konstantas et al. (eds.): Proceedings of the Int. Conf. on Object-Oriented Information Systems ,

        Lecture Notes in Computer Science 2817, Springer Verlag, Berlin, 2003, pp. 311-316

        See http://www.springerlink.com/content/5cpde26ygg6h7hpk    (abstract)

[48] E.O. de Brock and A. Boonstra: A Framework and a Tool to Generate E-Business Options.

        SOM Research Report 03A11, University of Groningen, 2003; 23 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/themeA/2003/03A11/03A11.pdf [PDF]    (full paper)

[47] A. Boonstra and E.O. de Brock: A Framework for Generating and Ordering E-Business Options.

        In Proceedings of the 24th McMaster World Congress on the Management of Electronic Business,

        Hamilton, Canada, 2003

[46] E.O. de Brock: Integrating Real Practical Experience in ICT Education.

        Journal of Information Systems Education, vol. 12 (3), 2001, pp. 133-140

        See http://www.jise.org/Issues/12/133.pdf [PDF]    (full paper)

[45] E.O. de Brock and H. Balsters:

        Towards a General Semantic Framework for Design of Federated Database Systems.

        SOM Research Report 01A26, University of Groningen, June 2001; 17 pages

[44]H. Balsters, E.O. de Brock, and S. Conrad (eds.): Database Schema Evolution and Meta-Modeling.

        Post-Proceedings of the DEMM2000-conference.

        Lecture Notes in Computer Science 2065, Springer Verlag, Berlin, 2001; 245 pages

        See http://link.springer.de/link/service/series/0558/tocs/t2065.htm    (book)

[43] E.O. de Brock: Integrating IT Education and the World Outside.

        In M. Khosrow-Pour (ed.): Proceedings IRMA-conference,

        Idea Group Publishing, Hershey (PA), 2000, pp. 863-864

[42] E.O. de Brock: Declarative Specifications of Complex Transactions, with an Application to Cascading Deletes.

        In G. Saake, K. Schwarz, and C. Türker (eds.): Post-Proceedings of the TDD’99-conference,

        Lecture Notes in Computer Science 1773, Springer Verlag, Berlin, 2000, pp. 150-166

        See http://link.springer.de/link/service/series/0558/bibs/1773/17730150.htm    (abstract)

[41] E.O. de Brock: A General Treatment of Dynamic Integrity Constraints.

        Data & Knowledge Engineering, vol. 32 (3), 2000, pp. 223-246

        See http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.98.2532&rep=rep1&type=pdf    (full paper)

[40] E.O. de Brock: Declarative Specifications of Complex Transactions.

        SOM Research Report 98A41, University of Groningen, October 1998; 24 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/1995-1999/themeA/1998/98A41/98a41.pdf  [PDF]    (full paper)

[39]S. Bulthuis and E.O. de Brock: Webservers based on an Objectdatabase.

        Informatie, July/August 1998, pp. 32-39 (in Dutch)

        See http://www.informatie.nl/Artikelen/1998/augustus/Webserversopbasisvaneenobjectdatabase.aspx    (abstract)

[38] E.O. de Brock: Higher Education and the ICT-labourmarket.  Informatie, February 1998, p. 53 (in Dutch)

[37] E.O. de Brock: A General Treatment of Dynamic Constraints.

        SOM Research Report 97A47, University of Groningen, November 1997; 23 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/1995-1999/themeA/1997/97A47/97a47.pdf [PDF]    (full paper)

[36] E.O. de Brock: An Exercise in the Structured Design of Complex Algorithms in (Extensions of) SQL.

        SOM Research Report 97A46, University of Groningen, October 1997; 25 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/1995-1999/themeA/1997/97A46/97a46.pdf [PDF]     (full paper)

[35] E.O. de Brock: Some Operations on Database Universes.

        SOM Research Report 97A38, University of Groningen, September 1997; 8 pages

        See http://som.eldoc.ub.rug.nl/FILES/reports/1995-1999/themeA/1997/97A46/97a46.pdf [PDF]  [PDF]     (full paper)

[34] E.O. de Brock: The Theme Datamining. Informatie, September 1997, p. 6 (in Dutch)

        See http://www.informatie.nl/Artikelen/1997/september/Thema-intro.aspx    (abstract)

[33] E.O. de Brock: Structured Design of Complex Algorithms in (Extensions of) SQL.

        Informatie, January 1997, pp. 48-53 (in Dutch). See

        http://www.informatie.nl/Artikelen/1997/januari/Complexealgoritmengestructureerdontwerpen.aspx    (abstract)

[32] E.O. de Brock: Marginalize or to be Marginalized?

        Informatie, March 1996, p. 19 (in Dutch)

[31] E.O. de Brock: Driving License Needed in the Modern Development Racing Car.

        Automatisering Gids, 19 January 1996, p. 15 (in Dutch)

[30] E.O. de Brock: Foundations of Semantic Databases.

        Prentice Hall International Series in Computer Science, Hemel Hempstead, 1995; 230 pages

[29] E.O. de Brock: System Specification WIS (Road Information System).

        Specification report for the Polder of Noord‑ and Zuid‑Beveland, 1992; 54 pages (in Dutch)

[28]E.O. de Brock, A.V. Koppelaars, and A.J.J. Leijten: Investigation of Development Environments.

        Investigation report, Remmen & De Brock, 1992; 20 pages (in Dutch)

[27] E.O. de Brock: Specification of the Career Planning System LBS.

        Specification report, Remmen & De Brock, 1992 (in Dutch)

[26] E.O. de Brock: Investigation into the Position of PowerHouse.

        Report of a contra‑expertise for a Dutch insurance company, 1991; 23 pages (in Dutch)

[25]E.O. de Brock, F. Remmen, and J.C. Wortmann:

        A Conceptual Model for Product‑Types and Bills‑of‑Material: Application of a Set‑Theoretic Approach.

        In R. Companys, P. Falster, and J.L. Burbidge (eds.): Databases for Production Management,

        North‑Holland, Amsterdam, 1990, pp. 3-37

[24] E.O. de Brock: Function and Usage of the Road and Traffic Databank of the Province of Zeeland.

        Advisory report for the Province of Zeeland, 1990; 15 pages (in Dutch)

[23]Independent Database Team ‑ Holland:

        A Functional Evaluation of Relational Systems using the Functional Benchmark.

        Proceedings IDT/EIT, Ghent (B), 1990

[22] E.O. de Brock: Evaluation of the Road and Traffic Databank of the Province of Zeeland.

        Evaluation report for the Province of Zeeland, 1990; 25 pages (in Dutch)

[21] E.O. de Brock: Formal Methods for Modeling Data Dictionaries.

        In Proceedings Frans Remmen Symposium, Eindhoven University of Technology, 1989, pp. 1‑18 (in Dutch)

[20]F. Remmen and E.O. de Brock: Comparative Research of Database Management Systems.

        Selection report for the Province of Zeeland, 1989 (in Dutch)

[19]Independent Database Team ‑ Holland: Evaluation of 16 Top RDBMS’s using the Functional Benchmark.

        Proceedings IDT/Codd&Date‑conference, Berlin, 1989

[18] E.O. de Brock: The Foundations of Semantic Databases.

        Academic Service, The Hague, 1989; 237 pages (in Dutch)

[17]IJ.J. Aalbersberg et. al.: Several Types of Knowledge and Inheritance.

        Philips Research Laboratories (PRISMA), 1989; 50 pages

[16] E.O. de Brock: And What about Performance? In [15].

[15]Independent Database Team ‑ Holland: Relational Database in Practice.

        Proceedings IDT/Codd&Date‑conference, London, 1988

[14]Databaseclub NGI: The Practical Use of Relational Systems Presented.

        Proceedings NGI‑conference (C34), Amsterdam, 1988; 272 pages (in Dutch)

[13] E.O. de Brock: Some Formal Aspects of Data Dictionaries.

        Philips Research Laboratories, NL‑14.638, 1988; 20 pages

[12] E.O. de Brock: A Non‑trivial Example of a Database Universe. In [11], pp. 21‑27 (in Dutch)

[11]Databaseclub NGI: The Practical Use of Relational Systems Presented.

        Proceedings NGI‑conference (C27), Utrecht, 1987; 195 pages (in Dutch)

[10]F. Remmen and E.O. de Brock:

        Evaluation LISSAH System: Its Usability as an Information System for Higher Vocational Education Schools.

        Evaluation report for the Dutch Council of Schools for Higher Vocational Education, 1987; 16 pages (in Dutch)

[9]   F. Remmen and E.O. de Brock: Technical Evaluation ADB (Agrarian Data Base).

        Evaluation report for the Ministry of Agriculture, 1986; 21 pages (in Dutch)

[8]   E.O. de Brock: The Mathematical Theory of Databases (Part II).

        Memorandum, Eindhoven University of Technology (Math/CS), 1985; 43 pages (in Dutch)

[7]   E.O. de Brock: The Mathematical Theory of Databases (Part I).

        Memorandum 84‑10, Eindhoven University of Technology (Math/CS), 1984; 39 pages (in Dutch)

[6]   Sections 1 - 4 of the chapter “Mathematical Tools” in the “Poly Automatization Handbook”.

        Royal PBNA, Arnheim (NL); 1984, 1987, etc.; 25 pages (in Dutch)

[5]   E.O. de Brock: Database Models and Retrieval Languages.

        Dissertation, Eindhoven University of Technology, 1984; 141 pages

[4]   E.O. de Brock:

        On Complete Proof Systems, with an Application to Positive and Boolean Dependencies in Database Relations.

        Memorandum, Eindhoven University of Technology (Math/CS), 1982; 43 pages

[3]   E.O. de Brock: Sets and Databases. In P.M.G. Apers (ed.): Colloquium Databank Organization (1),

        Mathematical Centre, Amsterdam, 1981, pp. 89‑116 (in Dutch)

[2]   E.O. de Brock: Tables, Table Variables, and Static Integrity Constraints.

        Memorandum 80‑12, Eindhoven University of Technology (Math/CS), 1980; 45 pages

[1]   E.O. de Brock: Product Sets and Database Relations.

        Memorandum 79‑16, Eindhoven University of Technology (Math/CS), 1979; 12 pages (in Dutch)