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Page content: ArticlesChen, V., Wu, H.X., & Ark, H.H. van (2009). More costly or more productivity? Measuring changes in competitiveness in manufacturing across regions in China. Review of Income and Wealth, 55(1), 514-537.
Ark, H.H. van, O'Mahony, M., & Timmer, M.P. (2008). The productivity gap between Europe and the U.S.:Trends and causes. Journal of Economic Perspectives, 22(1), 25-44.
Inklaar, R., Timmer, M.P., & Ark, H.H. van (2008). Market services productivity across Europe and the US. Economic Policy, 23(53), 139-194.
Broersma, L., & Ark, H.H. van (2007). ICT, Business services and labour productivity growth. Economics of Innovation and New Technology, 16(6), 433-449.
Inklaar, R., Timmer, M.P., & Ark, B. van (2007). Mind the gap! International comparisons of productivity in services and goods production. German Economic Review, 8(2), 281-307.
Ark, H.H. van, Inklaar, R., & Jong, G. de (2006). ICT-gebruik, productiviteit, groei en waardecreatie. Economisch Statistische Berichten, (4494S), 16-21.
Ark, H.H. van (2005). De goeie ouwe, nieuwe economie. Economisch Statistische Berichten, 304-304.
Ark, H.H. van (2005). Productiviteitsverbetering vergt meer dan ict. Information and Management, 9.
Ark, H.H. van, & Jong, G. de (2005). Innovatie en productiviteit: Cruciaal voor dienstverlenend success. Management Executive, 3(5), 40-43.
Ark, H.H. van, & Jong, G. de (2005). Succesvolle dienstverlenende organisaties sturen op productiviteit. Facility Management Magazine, 32, 1-13.
O'Mahony, M., & Ark, H.H. van (2005). Assessing the productivity of the UK retail trade sector: The role of ICT. International Review of Retail, Distribution and Consumer Research, 15(3), 297-303.
Timmer, M.P., & Ark, H.H. van (2005). IT in the European Union: A driver of productivity divergence? Oxford Economic Papers, 57(4), 693-716.
Timmer, M.P., Inklaar, R., & Ark, H.H. van (2005). Alternative output measurement for the U.S. retail trade sector. Monthly Labor Review, 128(7), 39-45.
Ark, H.H. van, & Piatkowski, M. (2004). Productivity, innovation and ICT in old and new Europe. International Economics and Economic Policy, 1(4), 215-246.
Ark, H.H. van, Inklaar, R., & McGuckin, R.H. (2003). ICT and productivity in Europe and the United States. Where do the differences come from? Ifo Studien, 3, 295-318.
Ark, H.H. van, Inklaar, R., McGuckin, R., & Timmer, M.P. (2003). The employment effects of the 'new economy'. A comparison of the European Union and the United States. National Institute Economic Review, 184, 86-98.
Haan, M.A., Schoonbeek, L., & Ark, H.H. van (2003). Introduction (to special issue on competition and market power). De Economist, 151(4), 351-355.
Hertog, P. den, Broersma, L., & Ark, H.H. van (2003). On the soft side of innovation: Services innovation and its policy implications. De Economist, 151(4), 433-452.
Ark, H.H. van (2002). Measuring the new economy: An international comparative perspective. Review of Income and Wealth, 47(1), 1-14.
Ark, H.H. van (2002). Mitkä toimialat johtavat globaalia tuottavuuskilpailua? EU, Suomi ja USA (Which industries lead the global productivity race? The European Union, Finland and the United States). Talous & Yhteiskunta (Economy and Society), 3, 9-14.
Ark, H.H. van (2002). Productiviteit, technologie en groei: een zaak van investeren? Tijdschrift voor Politieke Economie, 3, 3-21.
Ark, H.H. van, & Serrano , L. (2002). Productividad del sector manufacturas en Espana: medio siglo de crecimiento y convergencia (Productivity in Spanish manufacturing: half a century of growth and convergence). Historia Industrial, 19/20, 77-101.
Ark, H.H. van, & Timmer, M.P. (2002). Notes and communications: Industry productivity comparisons. De Economist, 150(1), 95-109.
Inklaar, R., Sleifer, J., & Ark, H.H. van (2002). Innovatie en productiviteit. Economisch Statistische Berichten, 14-16.
Ark, H.H. van (2001). Macro-economische statistiek: hoe en wat. Economisch Statistische Berichten, 15 maart, D8-D12.
Ark, H.H. van, & Haan, J. de (2001). The dynamics of growth, stagnation and recovery in Germany and the Netherlands since 1960. Jahrbuch fur Wirtschaftsgeschichte, 17-28.
Ark, H.H. van (2000). De Nederlandse productiviteitsparadox. Economisch Statistische Berichten, 974-976.
Ark, H.H. van (2000). Measuring productivity in the 'New Economy': towards an European perspective. De Economist, 1, 87-105.
Ark, H.H. van, & Haan, J. de (2000). The delta-model revisitied. International Review of Applied Economics, 13, 307-321.
Ark, H.H. van (1999). Boekbespreking van M. Pomp en J. van der Ven: 'Human capital as a contributor to growth slowdown?'. CPB Report: quarterly review of CPB Netherlands Bureau for Economic Policy Analysis, 4, 57-58.
Ark, H.H. van, & McGuckin, R.H. (1999). International comparisons of labor productivity and per capitia income. Monthly Labor Review, 7, 33-41.
Ark, H.H. van, Monnikhof, E.J., & Mulder, N. (1999). Productivity in services: an international comparative perspective. Canadian Journal of Economics, 2, 471-499.
Ark, H.H. van (1998). Boekbespreking van D.W. Jorgenson, Productivity, postwar US economic growth (volume 1) and Productivity, international comparisons of economic growth (volume 2). Journal of the Japanese and International Economies, 171-174.
Ark, H.H. van (1997). Boekbespreking van B. Eichengreen (red.), Europe's post-war recovery. De Economist, 3.
Ark, H.H. van (1997). New research in historical national accounting. Jahrbuch fur Wirtschaftsgeschichte, 2, 21-25.
Ark, H.H. van, & Jong, H.J. de (1996). Accounting for economic growth in the Netherlands since 1913. Economic and Social History in the Netherlands, 199-242.
Haan, J. de, & Ark, H.H. van (1996). Nederlandse economie presteert beter. Economisch Statistische Berichten, 516-518.
Part of book - ChaptersArk, H.H. van, Erumban, A.A., Chen, V., & Kumar, U. (2010). The cost competitiveness of manufacturing in China and India: An industry and regional perspective. In B. Eichengreen, P. Gupta & R. Kumar (Eds.), Emerging giants: China and India in the world economy. Oxford: Oxford University Press (ISBN 019957507X).
Ark, H.H. van, & Timmer, M.P. (2009). Purchasing power parity adjustments for productivity level comparisons. In D.S. Prasada Rao (Ed.), Purchasing power parities of currencies. Recent advances in methods and applications (pp. 344-366). Cheltenham: Edward Elgar.
Dougherty, S.M., Inklaar, R., McGuckin, R.H., & Ark, H.H. van (2007). International comparisons of R&D expenditure: Does an R&D PPP make a difference? In E.R. Berndt & C.M. Hulten (Eds.), Hard-to-measure goods and services: Essays in memory of Zvi Griliches (pp. 291-322-). University of Chicago Press.
Smits, J.P.H., & Ark, H.H. van (2007). Technology regimes and productivity growth in Europe and the United States: A comparative and historical perspective. In B. Eichengreen, N. Landesmann & D. Stiefel (Eds.), The European economy in an American mirror (pp. 41-61). London-New York: Routledge.
Ark, H.H. van (2006). Does the European Union need to revive productivity growth? In S. Mundschenk, M.H. Stierle, U. Stierle-von Schutz & I. Traistaru (Eds.), Competitiveness and growth in Europe. Lessons and policy implications for the Lisbon strategy (pp. 101-124-). Edward Elger Publishers.
Ark, H.H. van (2006). Productivitat i competitivitat. In Informe economic i social de les Illes Balears 2005 (pp. 289-315-).
Ark, H.H. van (2006). Recent productivity development in the European Union in comparative perspective - with a focus on the Netherlands. In G. Evers & T. Wilthagen (Eds.), Arbeidsproductiviteit en arbeidsdynamiek (OSA-publicatie, A217) (pp. 25-38-).
Ark, H.H. van, Jong, G. de, & Henriksen, T. (2006). Productivitet - En guide til vaerdiskabelse. In T.B. Hensriksen (Ed.), Skabt til vaekst, 15 vinkler pa Danmarks oekonomiske fremtid. Copenhagen: Borsoens Forlag.
Ark, H.H. van, & Timmer, M.P. (2006). Computers and the big divide: productivity growth in the European Union and the United States. In M. Mas & P. Schreyer (Eds.), Growth, capital and new technologies (pp. 14-169-). Bilbao: Fundacion BBVA.
Ark, H.H. van (2005). Misurazione ed analisi della produttivit nella l'economia della conoscenza. In A. Pilati & A. Perrucci (Eds.), Economia della conoscenza. Profili teorici ed evienze empiriche, autorit per la garanzie nelle communicazione (pp. 479-565). Milaan: FrancoAngeli.
Ark, H.H. van (2004). The measurement of productivity: what do the numbers mean? In G. Gelauff, L. Klomp, S. Raes & Th. Roeland (Eds.), Fostering productivity, patterns, determinants and policy implications (pp. 28-61). Amsterdam: Elsevier Science Publishers.
Ark, H.H. van (2003). Employment, income and productivity. In Key Indicators of the Labour Market Third edition. Geneva: International Labour Office, United Nations.
Ark, H.H. van (2003). National income accounts. Historical overview. In J. Mokyr (Ed.), The Oxford Encyclopedia of Economic History. Oxford: Oxford University Press.
Ark, H.H. van, & Inklaar, R. (2003). ICT production and use in Germany, Japan and the United States. In Prospects for Core Industries in Japan and Germany (pp. 108-122). Berlin: Japanese-German Center Berlin.
Ark, H.H. van, Inklaar, R., & McGuckin, R.H. (2003). Changing Gear: Productivity, ICT and Service Industries in Europe and the United States. In J.F. Christensen & P. Maskell (Eds.), The Industrial Dynamics of the New Digital Economy (pp. 56-99). London: Edward Elgar.
Ark, H.H. van, & Ypma, G. (2003). KILM 18: Labour productivity and unit labour cost indicator. In International Labour Office (UN) (Ed.), Key Indicators of the Labour Market Third edition. Geneva: International Labour Office, United Nations.
Timmer, M.P., & Ark, H.H. van (2003). Economic convergence and divergence. In J. Mokyr (Ed.), The Oxford Encyclopedia of Economic History (pp. 128-131). Oxford: Oxford University Press.
Ark, H.H. van (2002). Understanding productivity and income differentials among OECD countries: a survey. In A. Sharpe, F. St-Hilaire & K. Banting (Eds.), The review of economic performance and social progress. Towards a social understanding of productivity (pp. 69-92). Ottawa/Montreal: CSLS/IRPP.
Ark, H.H. van, & Timmer, M.P. (2002). Realising growth potential: South Korea and Tawain, 1960 to 1998. In A. Maddison, D.S. Prasada Rao & W.F. Shepherd (Eds.), The Asian economies in the twentieth century (pp. 226-242). London: Edward Elgar.
Maddison, A., & Ark, H.H. van (2002). The international comparison of real product and productivity. In A. Maddison, D.S. Prasada Rao & W.F. Shepherd (Eds.), The Asian economies in the twentieth century (pp. 5-26). London: Edward Elgar.
Timmer, M.P., & Ark, H.H. van (2002). Capital formation and foreign direct investment in Korea and Japan: Coping with diminishing returns. In J.Th. Lindblad (Ed.), Asian growth and foreign capital: Case studies from Eastern Asia (pp. 59-98). Amsterdam: Aksant.
Ark, H.H. van (2001). De 'klompenversie' van de productiviteitsparadox. In S. Brakman & A. van Witteloostuijn (Eds.), Jonge wijn in oude zakken; op weg naar een nieuwe Nieuwe Economie (pp. 121-137). Amsterdam: De Arbeiderspers.
Ark, H.H. van, & Monnikhof, E. (2001). KILM 18: Labour productivity and unit labour cost indicator. In Key indicators of the labour market 2001-2002. Geneva: International Labour Office.
Ark, H.H. van (2000). De vernieuwing van de oude economie: Nederland in een internationaal vergelijkend perspectief. In L. Soete (Ed.), ICT en de nieuwe economie, pre-adviezen van de Koninklijke Vereniging voor de Staatshuishoudkunde 2000 (pp. 21-59). Utrecht: Lemma.
Ark, H.H. van (2000). Income and productivity in the Netherlands: the role of the labour market and the public sector. In A. Clesse & H. van Gunsteren (Eds.), The vitality of the Netherlands (pp. 73-84). Luxemburg: Luxemburg Institute for European and International.
Ark, H.H. van (2000). Income and technological change in the Netherlands: causes and explanations of divergent trends. In H.H. van Ark, S.K. Kuipers & G.H. Kuper (Eds.), Productivity, technology and economic growth (pp. 159-186). Dordrecht/Boston/London: Kluwer Academic Publishers.
Ark, H.H. van (1999). A miracle or not: recent trends in the growth performance of the Dutch economy. In P.A.G. van Bergeijk, J. van Sinderen & B. Vollaard (Eds.), Structural reform in open economies (pp. 157-179). London: Edward Elgar.
Ark, H.H. van (1999). KILM 17: Labour productivity and unit labour costst. In International Labour Office (UN) (Ed.), Key Indicators of the Labour Market 1999, Geneva.
Ark, H.H. van, & Timmer, M.P. (1999). Prices, quantities and productivity in industry: a study of transition economies in a comparative perspective. In R. Lipsey & A. Heston (Eds.), International and Interarea Comparisons of Prices, Income and Output (pp. 327-364). Chicago: University of Chicago Press.
Ark, H.H. van (1997). The manufacturing sector in East Germany: a reassessment of comparative productivity performance, 1950-1988. In W. Fischer (Ed.), The economic development of Germany since 1870 (pp. 498-523). London: Edward Elgar.
Ark, H.H. van (1996). Convergence and Divergence in the European Periphery. In H.H. van Ark & N.F.R. Crafts (Eds.), Quantitative Aspects of Post-war European Economic Growth (pp. 271-326). Cambridge: Cambridge University Press.
Ark, H.H. van (1996). Productivity and Competitiveness in Manufaturing. In K. Wagner & H.H. van Ark (Eds.), International Productivity Differences, Measurements and Explanations. Amsterdam: North-Holland.
Ark, H.H. van (1996). Sectoral Growth Accounting and Stuctural Change in Post-War Europe. In H.H. van Ark & N.F.R. Crafts (Eds.), Quantitative Aspects of Post-war European Economic Growth (pp. 84-164). Cambridge: Cambridge University Press.
Ark, H.H. van, & Jong, H.J. de (1996). Characteristics of Economic growth in the Netherlands during the Post-war period. In N. Crafts & G. Toniolo (Eds.), Economic growth in Europe since 1945 (pp. 290-328). Cambridge: Cambridge University Press.
Mason, G., & Ark, H.H. van (1996). Productivity, Machinery and Skills in Engineering. In D.G. Mayes (Ed.), Sources of Productivity Growth. Cambridge: Cambridge University Press.
Mason, G., Ark, H.H. van, & Wagner, K. (1996). Workforce, product quality and economic performance. In A. Booth & D. Snower (Eds.), Acquiring Skills.Market Failures,Their symptoms and Policy Responses. Cambridge: Cambridge University Press.
Books - monographs - book editorialsTimmer, M.P., Inklaar, R., O'Mahony, M., & Ark, H.H. van (2010). Economic growth in Europe - A comparative industry perspective. Cambridge, UK: Cambridge University Press.
Ark, H.H. van, Hao, J.X., Corrado, C., & Hulten, C. (2009). Measuring intangible capital and its contribution to economic growth in Europe (EIB Papers, 14, 1). Luxembourg: European Investment Bank.
Ark, H.H. van, Erumban, A.A., Chen, V., & Kumar, U. (2008). The cost competitiveness of manufacturing in China and India: An industry and regional perspective (ICRIER Working papers, 228). New Delhi: ICRIER.
Ark, H.H. van, Banister, J., & Guillemineau, C. (2006). Competitive advantage of "low-wage" countries often exaggerated (Executive Action Series, No. 212, October). .: Executive Action.
Ark, H.H. van, Guillemineau, C., & McGuckin, R.H. (2006). As U.S. productivity slows, emerging economies grow rapidly, but Europe falls further behind (Executive Action Series, No. 176, January). .: Executive Action.
Inklaar, R., Timmer, M.P., & Ark, H.H. van (2006). Mind the gap! International comparisons of productivity in services and goods production (GGDC Research Memorandum, GD86). Groningen: GGDC.
Ark, H.H. van (2005). Does the European Union need to revive productivity growth? (GGDC Research Memorandum, GD75). Groningen: GGDC.
Ark, H.H. van, & Inklaar, R. (2005). Catching up or getting stuck? Europe's troubles to exploit ICT's productivity potential (GGDC Research Memorandum, GD79). Groningen: GGDC.
Ark, H.H. van, Stuivenwold, E., & Ypma, G. (2005). Unit labour costs, productivity and international competitiveness (GGDC Research Memorandum, GD80). Groningen: GGDC.
McGuckin, R.H., & Ark, H.H. van (2005). Performance 2005: Productivity, employment and income in the world's economies (Working Paper, 1364). New York: The Conference Board.
McGuckin, R.H., Spiegelman, M., & Ark, H.H. van (2005). The retail revolution. Can Europe match U.S. productivity performance? (Working Paper, 1358). New York: The Conference Board.
Piatkowski, M., & Ark, H.H. van (2005). ICT and productivity growth in transition economies: two-phase convergence and structural reforms (TIGER Working Paper Series, 72). Warschau: Leon Kozminski Academy of Entrepreneurship and Management.
Ark, H.H. van, Frankema, E.H.P., & Duteweerd, H. (2004). Productivity and employment growth: An empirical review of long and medium run evidence (GGDC Research Memorandum, GD71). Groningen: GGDC.
Ark, H.H. van, & Jong, G. de (2004). Productiviteit in dienstverlening, deel I: wat het is en waarom het moet. Assen: Van Gorcum.
Ark, H.H. van, & Piatkowski, M. (2004). Productivity, Innovation and ICT in old and new Europe (GGDC Research Memorandum, GD69). Groningen: GGDC.
McGuckin, R., & Ark, H.H. van (2004). Performance 2004: productivity, employment and income in the world's economies (Conference Board Working Papers, 1351). New York: The Conference Board.
Ark, H.H. van (2003). The productivity problem of the Dutch economy: Implications for economic and social policies and business strategy (Research Memorandum, GD64). Groningen: University of Groningen.
Inklaar, R., Wu, H.X., & Ark, H.H. van (2003). "Losing Ground" Japanese labour productivity and unit labour cost in manufacturing in comparison to the U.S. (GGDC Research Memorandum, GD64). Groningen: GGDC.
McGuckin, R., & Ark, H.H. van (2003). Performance 2001: Productivity, employment and income in the world's economies (Conference Board Working Papers, 1328). New York: The Conference Board.
Timmer, M.P., Ypma, G., & Ark, H.H. van (2003). IT in the European Union: Driving productivity divergence? (GGDC Research Memorandum, 67). Groningen: GGDC.
Ark, H.H. van (2001). The renewal of the Old Economy: an international comparative perspective. Paris: OECD.
McGuckin, R., & Ark, H.H. van (2001). Making the most of the information age, perspective on a global economy (Conference Board Working Papers, 1301). New York: The Conference Board.
McGuckin, R., & Ark, H.H. van (2001). Performance 2000: productivity, employment and income in the world's economies. New York: The Conference Board.
Ark, H.H. van (2000). Economic growth and labour productivity in Europe: half a century of East-West comparisons (126, C01). Groningen: SOM.
Ark, H.H. van (2000). Productivity and unit labour cost comparisons: a data base (417, 5). Geneva: International Labour Office.
Ark, H.H. van, Kuipers, S.K., & Kuper, G.H. (2000). Productivity, technology and economic growth. Dordrecht/Boston/London: Kluwer Academic Publishers.
McGuckin, R., Ark, H.H. van, & Barrington, L. (2000). Perspectives on global economy: are poor nations closing the gap in living standards (225, 1263). -: -.
Timmer, M.P., & Ark, H.H. van (2000). Capital formation and productivity growth in South Korea and Taiwan (128, 2,1). University of Groningen.
Ark, H.H. van (1999). Accumulation, productivity and technology: measurement and analysis of long term economic growth (128, 1,2). Groningen: Centrum voor Conjunctuur- en Structuuronderzoek.
Ark, H.H. van (1999). Economic growth and labour productivity in Europe: Half a century of East-West comparisons (127, 41). Groningen: Groningen Growth and Development Center.
Ark, H.H. van (1999). Innovation in services: overview of data sources and analytical structures (127, GD44). Groningen: Groningen Growth and Development Center.
McGuckin, R., & Ark, H.H. van (1999). Perspectives on a global economy. The Euro's impact on European labor markets (225, 1236). -: -.
Smits, J.P.H., Jong, H.J. de, & Ark, H.H. van (1999). Three phases of Dutch economic growth and technological change, 1815-1997 (127, 42). Groningen: Groningen Growth and Development Center.
Ark, H.H. van (1998). Productivity in a global economy, The Conference Board, Understanding people factors in the quest for competitiveness (225, 1220). -: -.
McGuckin, R., & Ark, H.H. van (1998). Perspectives on a global economy: Asia after the crisis: challenges for a return to rapid growth (225). -: -.
Ark, H.H. van (1997). Challenging partners (222, 4). Den Haag: CPB Netherlands Bureau of Economic Policy Analysis.
Ark, H.H. van (1997). Economic growth in the long run. A history of empirical evidence. London: Edward Elgar.
Ark, H.H. van (1997). The delta-model revisited: recent trends in the structural performance of the Dutch economy (226, 38). University of Groningen.
Fremdling, R., & Ark, H.H. van (1997). Volkswirtschaftliche Gesamtrechnung und Leistung im intertemporalen und internationalen Vergleich: Belgien, Niederlande, Deutschland, Sowjetunion, USA, DDR. -: -.
Hertog, P. den, Ark, H.H. van, & Bilderbeek, R. (1997). Towards a structural information provision on the role of services in innovation: feasibility study ID-2 project, TNO-STB (237). University of Groningen.
McGuckin, R., & Ark, H.H. van (1997). Perspectives on a global economy. Understanding differences in economic performance (225, 1187). -: -.
McGuckin, R., Stiroh, K., & Ark, H.H. van (1997). Perspectives on a global economy. Technology, productivity and growth: US and German issues (225, 1206). -: -.
Ark, H.H. van (1996). Enhancing growth through structural reform (126, C16). Groningen: SOM.
Ark, H.H. van (1996). Issues in Measurement and International Comparison of Productivity (127, 28). Groningen: Groningen Growth and Development Center.
Ark, H.H. van (1996). Size distribution of output and employment (164, 166). Paris: OECD.
Ark, H.H. van, & Crafts, N.F.R. (1996). Quantitative Aspects of Post-war European Economic Growth. Cambridge: Cambridge University Press.
Buyst, E., Dejongh, B., Ark, H.H. van, & Zanden, J.L. van (1996). Historical Benchmark Comparisons of Output and Productivity (162, 03). Leuven: Centrum voor Economische Studien.
Liberda, B.Z., & Ark, H.H. van (1996). Manufacturing productivity performance in Poland and West Germany in 1989 (163, 25). Warzawa: University of Warsaw.
Wagner, K., & Ark, H.H. van (1996). International Productivity Differences, Measurements and Explanations. Amsterdam: North-Holland.
Book reviewsArk, H.H. van (2005). In search of the silver bullet for productivity growth [Book review The power of productivity & Transforming the European Economy]. International Productivity Monitor.
External reportsArk, H.H. van, Broersma, L., & Hertog, P. den (2003). Services innovation, performance and policy: A review, synthesis report in the framework of the project Structurele informatievoorziening in Diensten (SIID) (Structural Information Provision on Innovation in Services). Den Haag: Strategy, Research & International Co-operation Department Directorate-General for Innovation.
McGuckin, R., Ark, H.H. van, & Barrington, L. (2000). Perspectives on a global economy: are poor nations closing the gap in living standards? - onbekend -: - onbekend -.
Ark, H.H. van (1998). Economische groeivooruitzichten: het Nederlandse wonder ten einde? ABN-AMRO, Nederlands in het nieuwe Europa: op weg naar hogere economische groei. - onbekend -: - onbekend -.
Ark, H.H. van, & Mulligen, P.H. van (1998). Purchasing power parities for industry comparisons. Final report for a project for BAK-Basel, Switzerland. - onbekend -: University of Groningen.
LecturesArk, Bart. Productiviteit, technologie en groei : een zaak van investeren? full text
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prof. dr. H.H. (Bart) van Ark |
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