1. Formerly IFP, Rueil-Malmaison, France, and École des Mines de Paris, France; presently ExxonMobil, Houston, Texas, U.S.A. .
2. Formerly IFP, Rueil-Malmaison, France; presently Total-CSTJF, Pau, France. .
3. IFP, Rueil-Malmaison, France. .
4. University Paris-Sud, Tao Project-Team, INRIA Futurs, Paris, France. .