Yannis Manolopoulos, George A. Papadopoulos, Theodoros Tzouramanis: Proceedings of the SOFSEM 2020 Doctoral Student Research Forum co-located with the 46th International Conference on Current Trends in Theory and Practice of Computer Science (SOFSEM 2020), Limassol, Cyprus, January 20-24, 2020. CEUR Workshop Proceedings 2568, CEUR-WS.org 2020