collection: 2lang: el_or_enauthor: Papaioannou, Angelos_or_Lekka, Maria Eleni E_or_Tsotsou, Georgia Eleni_or_Fountzoula, Christina_or_Spyropoulos, Vasileios_or_Nintos, AlexandrossubjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_VI. HUMANITIES AND ARTS