Behaviour of finite automata in infinite environment [Abstract of thesis] Josef Úlehla — 1990 Commentationes Mathematicae Universitatis Carolinae
On racial insufficiency: White messengers cannot simulate coloured ones Josef Úlehla — 1985 Commentationes Mathematicae Universitatis Carolinae
Notes on characterization of paracompact frames Aleš Pultr; Josef Úlehla — 1989 Commentationes Mathematicae Universitatis Carolinae