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@article{IM_1995__122_3_144321, author = {Bernhard Leeb}, title = {3-manifolds with(out) metrics of nonpositive curvature.}, journal = {Inventiones mathematicae}, pages = {277--290}, publisher = {mathdoc}, volume = {122}, number = {3}, year = {1995}, zbl = {0840.53031}, url = {http://geodesic.mathdoc.fr/item/IM_1995__122_3_144321/} }
Bernhard Leeb. 3-manifolds with(out) metrics of nonpositive curvature.. Inventiones mathematicae, Tome 122 (1995) no. 3, pp. 277-290. http://geodesic.mathdoc.fr/item/IM_1995__122_3_144321/