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First Author:
 
Refk Selmi
Business School of Tunis
s.refk@yahoo.fr
 
, Campus Universitaire de la Manouba
, 2100, Tunisie
 
21697675635(Phone)
21697675635(Fax)

Second Author:

Jamal Bouoiyour
University of Pau
jamal.bouoiyour@univ-pau.fr
 
, 64000, France