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@article{AA_1993_5_1_a6, author = {S. V. Buyalo}, title = {An example of a~four-dimensional manifold of negative curvature}, journal = {Algebra i analiz}, pages = {193--199}, publisher = {mathdoc}, volume = {5}, number = {1}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1993_5_1_a6/} }
S. V. Buyalo. An example of a~four-dimensional manifold of negative curvature. Algebra i analiz, Tome 5 (1993) no. 1, pp. 193-199. http://geodesic.mathdoc.fr/item/AA_1993_5_1_a6/