Peter Vojtás, Mária Bieliková, Bernadette Charron-Bost, Ondrej Sýkora: SOFSEM 2005: Theory and Practice of Computer Science, 31st Conference on Current Trends in Theory and Practice of Computer Science, Liptovský Ján, Slovakia, January 22-28, 2005, Proceedings. Lecture Notes in Computer Science 3381, Springer 2005, ISBN 3-540-24302-X