SOFSEM 2009: Theory and Practice of Computer Science 35th Conference on Current Trends in Theory and Practice of Computer Science, Špindlerův Mlýn, Czech Republic, January 24-30, 2009. Proceedings - Nielsen, Mogens; Kučera, Antonín; Miltersen, Peter Bro; Palamidessi, Catuscia; Tůma, Petr; Valencia, Frank (Springer Berlin Heidelberg : Imprint: Springer, 2009)