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First Author:
 
Helmi Hamdi
Aix-Marseille University CERGAM (EA 4225)
helmi_aix@yahoo.fr
 
 
 
 

Second Author:

Rashid Sbia
DULBEA, Solvay Business and Economics School
r_sbia@hotmail.com
 
 
 
 

Third Author:

Hakimi Abdelaziz
FSEJG University of Jendouba
abdelazizhakimi@yahoo.fr
 
 
 
 

Fourth Author:

Wafa Khlaifia hakimi
FSEGJ University of Jendouba
wafakhlaifia@yahoo.fr