SOFSEM 2008: Theory and Practice of Computer Science : 34th Conference on Current Trends in Theory and Practice of Computer Science, Nový Smokovec, Slovakia, January 19-25, 2008, Proceedings - Viliam Geffert, Juhani Karhumäki, Alberto Bertoni, Bart Preneel, Pavol Návrat, Mária Bieliková ((Lecture Notes in Computer Science))