author: Lilakos, Konstantinos_or_Gitzenis, Savvas_or_Papanikolaou, Georgios_or_Toumpis, Stavros_or_Perivolaropoulos, Leandros_or_��������������������������������, ����������������__elsubjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_II. NATURAL SCIENCES AND AGRICULTURAL SCIENCESlang: el