SOFSEM 2006: Theory and Practice of Computer Science 32nd Conference on Current Trends in Theory and Practice of Computer Science, Merin, Czech Republic, January 21-27, 2006. Proceedings - Wiedermann, Jiří; Tel, Gerard; Pokorný, Jaroslav; Bieliková, Mária; Štuller, Július (Springer Berlin Heidelberg, 2006)