Germs, R. (2012, January 19). Controlling the order pool in make-to-order production systems. Rijksuniversiteit Groningen (128 pag.). (Groningen: Research School SOM) (ISBN 978-90-367-5262-6). Prom./coprom.: Prof.dr. J. Slomp, Dr. J. Riezebos & Dr. N. van Foreest (ISBN 978-90-367-5262-6).
Germs, R., & Foreest, N. van (2012). Analysis of finite-buffer state-dependent bulk queues. OR Spectrum.
Germs, R., Goldengorin, B., & Turkensteen, M. (2012). Lower tolerance-based branch and bound algorithms for the ATSP. Computers & Operations Research, 39(2), 291-298.