subjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_VI. HUMANITIES AND ARTS__enauthor: Cheliotis, Dimitrios_or_Bratsos, Athanasios_or_Nikolaidis, Nikolaos_or_Grontas, Panagiotis_or_Eleftheriadis, Ioannis