Simulations of Pawlak machines as fuzzy morphisms of partial algebras Jan Fried — 1977 Commentationes Mathematicae Universitatis Carolinae
On paracompactness in uniform spaces Jan Fried — 1985 Commentationes Mathematicae Universitatis Carolinae
Remarks on certain uniform covering properties Jan Fried; Aarno Hohti — 1984 Commentationes Mathematicae Universitatis Carolinae
Open cover of a metric space admits l ∞ -partition of unity Fried, Jan — 1984 Proceedings of the 11th Winter School on Abstract Analysis