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@article{DAN_1983_268_4_a0, author = {N. A. Gusevskii}, title = {On the fundamental group of a manifold of negative curvature}, journal = {Doklady Akademii Nauk}, pages = {777--781}, publisher = {mathdoc}, volume = {268}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a0/} }
N. A. Gusevskii. On the fundamental group of a manifold of negative curvature. Doklady Akademii Nauk, Tome 268 (1983) no. 4, pp. 777-781. http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a0/