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ralph lauren polo


First Author:
 
Giscard Assoumou-Ella
CIREGED, Omar Bongo University
g.assoumouella@gmail.com
 
Libreville, 13131, Gabon
 
 
 

Second Author:

Myriam Ben Saâd
PRISM, University of Paris 1, France
myriambensaad@yahoo.fr
 
Paris, France