Study realised by Philippe Bertrand (GREQAM, Aix – Marseille 2 University) and Jean-Luc Prigent (THEMA, Cergy-Pontoise University)

Study conducted by Phillipe Bertrand (GREQAM, Aix – Marseille 2 University and Jean-Luc Prigent (THEMA, Cergy – Pontoise University)