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First Author:
 
FTITI ZIED
Hight Business institute of Tunsia ISG- FIESTA laboratory and UAQUAP Laboratory
zftitio@gmail.com
 
zftitio@gmail.com
, 69120, France
 
0033(6)48177214(Phone)
0033(6)48177214(Fax)
http://ideas.repec.org/e/pft1.html

Second Author:

Sahbi Saadi
Hight Business institute of Tunsia ISG and UAQUAP Laboratory
essaadi_s@yahoo.fr
 
, Tunisia
 
0021698604105(Phone)
 
http://ideas.repec.org/e/pes65.html