collection: 2subjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_III. ENGINEERING AND TECHNOLOGYauthor: Pagourtzis, Aristeidis_or_Papaioannou, Angelos_or_Spyropoulos, Vasileios_or_Παγουρτζής, Αριστείδης__el