First Author:   Pascal Toquebeuf Paul Cézanne University and GREQAM pascal.toquebeuf@gmail.com   Bât. Austerlitz, 15-19 allée Claude Forbin Aix-en-Provence, 13627, France   (+0033) 4 42 50 86 30(Phone) (+0033) 4 42 50 86 30(Fax) Second Author: André Lapied Paul cézanne University, GREQAM and IDEP a.lapied@univ-cezanne.fr