subjectTerm: I. MATHEMATICS AND COMPUTER SCIENCE_or_VI. %CE%91%CE%9D%CE%98%CE%A1%CE%A9%CE%A0%CE%99%CE%A3%CE%A4%CE%99%CE%9A%CE%95%CE%A3 %CE%95%CE%A0%CE%99%CE%A3%CE%A4%CE%97%CE%9C%CE%95%CE%A3 %CE%9A%CE%91%CE%99 %CE%A4%CE%95%CE%A7%CE%9D%CE%95%CE%A3__elauthor: Gounaris, Anastasios_or_Manolopoulos, Ioannis_or_Cheliotis, Dimitrioslang: el