-гладкие изометрические погружения
-гладкие поверхности ограниченной внешней положительной кривизны
Characterizations of the sphere by the curvature of the second fundamental form
Collapsing and soul theorem in three-dimension
Convex functionals and generalized harmonic maps into spaces of non positive curvature.
Convex Surfaces Whose Geodesics Are Planar.
Corrections to my paper "On the geometry of convex reflectors" (Banach Center Publ. 57 (2002), 155-169)