SOFSEM 2005 Communications : 31st Conference on Current Trends in Theory and Practice of Computer Science. January 22-28, Liptovský Ján, Slovak Republic - Vojtáš, Peter; Charron-Bost, Bernadette; Sýkora, Ondrej; Bieliková, Mária, 1966- (Slovak Society for Computer Science, 2004)