Tomás Bures Riccardo Dondi Johann Gamper Giovanna Guerrini Tomasz Jurdzinski Claus Pahl Florian Sikora Prudence W. H. Wong SOFSEM 2021: Theory and Practice of Computer Science - 47th International Conference on Current Trends in Theory and Practice of Computer Science, SOFSEM 2021, Bolzano-Bozen, Italy, January 25-29, 2021, Proceedings SOFSEM Springer 2021 Lecture Notes in Computer Science 12607 978-3-030-67730-5 978-3-030-67731-2 https://doi.org/10.1007/978-3-030-67731-2 db/conf/sofsem/sofsem2021.html