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George E. Chatzarakis
Department of Electrical and Electronic Engineering Educators
School of Pedagogical and Technological Education (ASPETE)Athens, GREECE
Said R. Grace
Department of Engineering Mathematics
Faculty of Engineering, Cairo UniversityOrman, Giza, EGYPT
Irena JadloyskÁ
Department of Mathematics and Theoretical Informatics
Faculty of Electrical Engineering and Informatics Technical University of KoşsiceKoşice, SLOVAKIA