Grechneva M. A.
Ukr. Mat. Zh. - 2016. - 68, № 10. - pp. 1320=1329
We study the properties of submanifolds of the Grassmanian manifold of the four-dimensional pseudo-Euclidean space and also the Grassman image of a surface in this space. The theorem on the existence of a surface in the pseudo-Euclidean space with the given Grassman image is formulated and proved.