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@article{IVM_1994_2_a11, author = {N. A. Chernikov}, title = {Lobachevskii geometry and the modern theory of gravitation}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {60--66}, publisher = {mathdoc}, number = {2}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1994_2_a11/} }
N. A. Chernikov. Lobachevskii geometry and the modern theory of gravitation. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1994), pp. 60-66. http://geodesic.mathdoc.fr/item/IVM_1994_2_a11/