lang: elauthor: Andrikopoulos, Nikolaos_or_Grontas, Panagiotis_or_Lianos, Theodoros_or_Pagourtzis, Aristeidis_or_������������, ����������������__elsubjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_V. LAW AND SOCIAL SCIENCES_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES