Affiliation: | 1. Eindhoven University of Technology, Faculty of Technology Management , PAV D-13, PO Box 513, NL-5600 MB Eindhoven, The Netherlands E-mail: M.H.Jansen-Vullers@tm.tue.nl;2. University of Groningen , PO Box 800, 9700 AB Groningen, The Netherlands E-mail: J.C.Wortmann@bdk.rug.nl;3. Wageningen University , Dreijenplein 2, 6703 HB Wageningen, The Netherlands E-mail: adrie.beulens@wur.nl |