SOFSEM 2012: Theory and Practice of Computer Science : 38th Conference on Current Trends in Theory and Practice of Computer Science Špindlerův Mlýn, Czech Republic January 21-27, 2012 Proceedings, Vol. II - Bieliková, Mária, 1966-; Friedrich, Gerhard; Gottlob, Georg; Katzenbeisser, Stefan; Špánek, Roman; Turán, György (Istitute of Computer Science AS CR, 2012)