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First Author:
 
Paulo S.A. Sousa
Faculdade de Economia do Porto
paulus@fep.up.pt
 
Fac. de Economia do Porto, R. Dr. Roberto Frias, 80
Porto, 4200-464 PORTO, Portugal
 
225571215(Phone)
225571215(Fax)

Second Author:

Pedro Cosme C. Vieira
Fac. de Economia do Porto
pcosme@fep.up.pt
 
Porto, 4200-464, Portugal