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@article{DAN_1961_136_6_a5, author = {N. V. Efimov}, title = {The validity of {Hilbert's} theorem on surfaces of constant negative curvature}, journal = {Doklady Akademii Nauk}, pages = {1283--1286}, publisher = {mathdoc}, volume = {136}, number = {6}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a5/} }
N. V. Efimov. The validity of Hilbert's theorem on surfaces of constant negative curvature. Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1283-1286. http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a5/