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First Author:
 
Massimo A. De Francesco
Department of Economics and Statistics, University of Siena
defrancesco@unisi.it
 
Dipartimento di Economia Politica e Statistica, Piazza San Francesco, 7
Siena, 53100, Italy
 
+39.0577.232690(Phone)
+39.0577.232690(Fax)