subjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES__enauthor: Bratsos, Athanasios_or_Zachos, Efstathios_or_Toumpis, Stavros_or_Nikolopoulos%2C Stavros_or_Stamatis%2C Dimosthenis_or_Spyropoulos%2C Vasileioslang: el