Affiliation: | a Department of Technology Management, TU Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands b Institut für Informatik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany c Department of Mathematics and Computer Science, TU Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |