On homological dimensions of cocommutative Hopf algebras R. Kiełpiński — 1978 Colloquium Mathematicae
On three types of simplicial objects S. Balcerzyk; Phan Chan; R. Kiełpiński — 1976 Fundamenta Mathematicae
Exact sequences of pairs in commutative rings R. Kiełpiński; G. Simson; A. Tyc — 1978 Fundamenta Mathematicae