author: Kefalas, Petros_or_Doukissas, Leonidas_or_Stamatis, Dimosthenis_or_Vasileiadis, Nikolaos_or_Papanikolaou, Georgios_or_Perivolaropoulos, Leandros_or_Περιβολαρόπουλος, Λέανδρος__elsubjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCESlang: el