On closed graph theorems in topological spaces and groups Marek Wilhelm — 1979 Fundamenta Mathematicae
Almost lower semicontinuous multifunctions and the Souslin-graph theorem Marek Wilhelm — 1982 Commentationes Mathematicae Universitatis Carolinae
A common generalization of Kelley's theorem (concerning measures on Boolean algebra) and on von Neumann's minimax theorem Wilhelm, Marek — 1976 Abstracta. 4th Winter School on Abstract Analysis