SOFSEM 2012 - Theory and Practice of Computer Science 38th Conference on Current Trends in Theory and Practice of Computer Science, pindlerv Mlýn, Czech Republic, January 21-27, 2012, Proceedings - Bielikova,Maria; Friedrich,Gerhard; Gottlob,Georg; Katzenbeisser,Stefan; Turán,György (Lecture Notes in Computer Science / Theoretical Computer Science and General Issues Ser.)