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math.DG2013★ 35 cited
General Rotational Surfaces in the Four-dimensional Minkowski Space
Georgi Ganchev, Velichka Milousheva
General rotational surfaces as a source of examples of surfaces in the four-dimensional Euclidean space have been introduced by C. Moore. In this paper we consider the analogue of…
math.DG2013
Directed Riemannian manifolds of pointwise constant relative sectional curvature
Georgi Ganchev, Vesselka Mihova
We study a class of Riemannian manifolds with respect to the covariant derivative of their curvature tensors. We introduce geometrically the class of directed Riemannian manifolds…