Institution: | aDepartment of Information and Telecommunications Engineering, University of West Macedonia, Kozani, Greece;bDepartment of Communications, Informatics and Management, Technological Educational Institute of Epirus, Arta, Greece;cGeneral Chemical State Laboratory, Tsoha 16, 115 21 Athens, Greece;dDepartment of Economics, University of Ioannina, Panepistimioupoli, GR-451 10 Ioannina, Greece |