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First Author:
 
wafa amor snoussi
high institute of management
wafa_snoussi@yahoo.fr
 
wafa_snoussi@yahoo.fr
Ariana, 2080, Tunis
 
+21697981575(Phone)
+21697981575(Fax)
-

Second Author:

Mhamed-Ali El-Aroui
university of management of Nabeul
mhamed.elaroui@yahoo.com