1. SLOOP, I3S-CNRS-INRIA, Université de Nice – Sophia Antipolis, 2004, route des Lucioles – B.P. 93, F-06902 Sophia Antipolis Cedex, France
2. I3S CNRS, Université de Nice – Sophia Antipolis, bât. ESSI, BP 145, 930 route des Colles, 06903 Sophia Antipolis, France
3. The Fuqua School of Business, Duke University, Durham, NC 27708-0120, USA
4. Department of Mathematics and RUTCOR, Rutgers University, New Brunswick, NJ 08903, USA