On manifolds satisfying some curvature conditions Ryszard Deszcz; Wiesław Grycak — 1989 Colloquium Mathematicae
On certain curvature conditions on Riemannian manifolds Ryszard Deszcz; Wiesław Grycak — 1990 Colloquium Mathematicae
On the existence of certain types of Riemannian metrics Wiesław Grycak; Marian Hotloś — 1982 Colloquium Mathematicae