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@article{DAN_1961_139_5_a2, author = {R. M. Geidel'man}, title = {The theory of a hypersurface in four-dimensional {non-Euclidean} spaces}, journal = {Doklady Akademii Nauk}, pages = {1040--1043}, publisher = {mathdoc}, volume = {139}, number = {5}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_5_a2/} }
R. M. Geidel'man. The theory of a hypersurface in four-dimensional non-Euclidean spaces. Doklady Akademii Nauk, Tome 139 (1961) no. 5, pp. 1040-1043. http://geodesic.mathdoc.fr/item/DAN_1961_139_5_a2/