subjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES__entype: 7author: Cheliotis, Dimitrios_or_Gitzenis, Savvas_or_Toumpis, Stavros_or_Sakellariou, Ilias_or_Kefalas, Petros_or_Spyropoulos, Vasileioslang: el