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First Author:
 
Raffaella Santolini
Department of Economics and Social Sciences Polytechnic University of Marche
r.santolini@univpm.it
 
, Piazzale Martelli 8
Ancona, 60121, Italy
 
 
 

Second Author:

David Bartolini
Department of Economics and Social Sciences Polytechnic University of Marche
d.bartolini@univpm.it
 
, Piazzale Martelli 8
Ancona, 60121, Italy