Generalized graph-manifolds of nonpositive curvature
Algebra i analiz, Tome 11 (1999) no. 2, pp. 64-87.

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@article{AA_1999_11_2_a2,
     author = {S. V. Buyalo and V. L. Kobel'skii},
     title = {Generalized graph-manifolds of nonpositive curvature},
     journal = {Algebra i analiz},
     pages = {64--87},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1999_11_2_a2/}
}
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S. V. Buyalo; V. L. Kobel'skii. Generalized graph-manifolds of nonpositive curvature. Algebra i analiz, Tome 11 (1999) no. 2, pp. 64-87. http://geodesic.mathdoc.fr/item/AA_1999_11_2_a2/