Affiliation: | 1.Department of Economics, University of Thessaly, Volos, Greece ;2.Computer Technology Institute & Press - “DIOPHANTUS”, University of Patras Campus, Nikou Kazantzaki str., GR-256504, Rio, Patras, Greece ;3.Computer Engineering and Informatics Department, University of Patras, GR-26504, Rio, Patras, Greece ;4.Business Administration Department, University of Patras, GR-26504, Rio, Patras, Greece ; |