subjectTerm: II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_I. MATHEMATICS AND COMPUTER SCIENCE_or_III. ENGINEERING AND TECHNOLOGYdatepublished: 2015author: Papaioannou, Angelos_or_Kroupis, Christos_or_Spyropoulos, Vasileios_or_Σπυρόπουλος, Βασίλειος__el