author: Plageras, Panagiotis_or_Aggelopoulos, Eleftherios_or_Zoi, Georgiou_or_Spyropoulos, Vasileios_or_Georgopoulos, Antonios_or_Λιανός, Θεόδωρος__elsubjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCESlang: el