SOFSEM 2001: Theory and Practice of Informatics 28th Conference on Current Trends in Theory and Practice of Informatics Piestany, Slovak Republic, November 24 - December 1, 2001. Proceedings - Pacholski, Leszek; Pacholski, Leszek; Ruzicka, Peter; Ruzicka, Peter (Springer Berlin Heidelberg : Imprint: Springer, 2001)