Three-dimensional manifolds of nonpositive curvature containing
Doklady Akademii Nauk, Tome 307 (1989) no. 5, pp. 1037-1040.

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@article{DAN_1989_307_5_a1,
     author = {S. V. Buyalo},
     title = {Three-dimensional manifolds of nonpositive curvature containing},
     journal = {Doklady Akademii Nauk},
     pages = {1037--1040},
     publisher = {mathdoc},
     volume = {307},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_5_a1/}
}
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S. V. Buyalo. Three-dimensional manifolds of nonpositive curvature containing. Doklady Akademii Nauk, Tome 307 (1989) no. 5, pp. 1037-1040. http://geodesic.mathdoc.fr/item/DAN_1989_307_5_a1/