Generalized Symmetric Submanifolds of Euclidean Spaces. O. Kowalski; I. Kulich — 1987 Mathematische Annalen
A New Formula for the Shape Operator of a Geodesic Sphere and Its Applications. O. Kowalski; L. Vanhecke — 1986 Mathematische Zeitschrift
The Classification of ...-symmetric Sasakian Manifolds. O. Kowalski; J.A. Jiménez — 1993 Monatshefte für Mathematik
On curvatures of linear frame bundles with naturally lifted metrics. Kowalski, O.; Sekizawa, M. — 2005 Rendiconti del Seminario Matematico
On three-dimensional hypersurfaces with type number two in ℍ 4 and 𝕊 4 treated in intrinsic way Hájková, V.; Kowalski, O.; Sekizawa, M. — 2004 Proceedings of the 23rd Winter School "Geometry and Physics"