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First Author:
 
Hammoudi Abdelhakim
INRA-ALISS
hammoudi@ivry.inra.fr
 
65 Boulevard Brandebourg
Ivry sur seine, 94205, France
 
33 1 49 59 69 05(Phone)
33 1 49 59 69 05(Fax)

Second Author:

Giraud-héraud Eric
*INRA-ALISS and Ecole Polytechnique, Laboratoire d''Econométrie, France
giraud@ivry.inra.fr