[1] Free Univ Brussels, Pharmaceut Inst, B-1090 Brussels, Belgium
[2] Royal Agr & Vet Univ, MLI, LMT, Chemometr Grp, DK-1958 Frederiksberg, Denmark
[3] Total France CReS, F-69360 Solaize, France
[4] Univ Marne La Vallee, Equipe Anal & Math Appl, F-77454 Marne La Vallee, France
[5] Univ Orsay, Equipe Probabilite & Stat, Lab Math, F-91405 Orsay, France