collection: 2subjectTerm: II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_VI. HUMANITIES AND ARTS_or_III. ENGINEERING AND TECHNOLOGY_or_I. MATHEMATICS AND COMPUTER SCIENCEauthor: Gitzenis, Savvas_or_Toumpis, Stavros_or_Androulidakis, Ioannis_or_Katsaros, Panagiotis