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First Author:
 
Carl Gaigné
INRA, UR122
gaigne@rennes.inra.fr
 
Rennes, France
 
 
 
http://www.rennes.inra.fr/economie/membres/gaign%E9.htm

Second Author:

Stéphane Riou
University of Saint-Etienne
stephane.riou@univ-st-etienne.fr