1. Aix Marseille University; CNRS - Laboratoire d'Economie et de Sociologie du Travail; (LEST UMR 6123); 13626 Cedex 01; Aix-en-Provence; France
2. Nice Sophia Antipolis University; Research Laboratory GREDEG UNSA - CNRS; UMR 6227, 250 rue Albert Einstein, Bt 2; 06560; Valbonne; France
3. Eindhoven University of Technology; School of Industrial Engineering; PO Box 513; 5600 MB; Eindhoven; The Netherlands