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@article{AA_2002_14_5_a9, author = {P. V. Svetlov}, title = {Graph-manifolds of nonpositive curvature are virtually fibered over a~circle}, journal = {Algebra i analiz}, pages = {188--201}, publisher = {mathdoc}, volume = {14}, number = {5}, year = {2002}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_2002_14_5_a9/} }
P. V. Svetlov. Graph-manifolds of nonpositive curvature are virtually fibered over a~circle. Algebra i analiz, Tome 14 (2002) no. 5, pp. 188-201. http://geodesic.mathdoc.fr/item/AA_2002_14_5_a9/