SOFSEM '99 : theory and practice of informatics : 26th Conferrence on Current Trends in Theory and Practice of Informatics : Milovy, Czech Republic, November 27 - December 4, 1999 : proceedings - Pavelka, Jan; Tel, Gerard, 1962-; Bartošek, Miroslav, 1957- (Lecture notes in computer science ;, 1999)