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@article{AA_1989_1_6_a1, author = {S. V. Buyalo}, title = {Collapsing manifolds of nonpositive {curvature.~II}}, journal = {Algebra i analiz}, pages = {70--97}, publisher = {mathdoc}, volume = {1}, number = {6}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1989_1_6_a1/} }
S. V. Buyalo. Collapsing manifolds of nonpositive curvature.~II. Algebra i analiz, Tome 1 (1989) no. 6, pp. 70-97. http://geodesic.mathdoc.fr/item/AA_1989_1_6_a1/