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@article{IM_1985__79_143199, author = {Viktor Schroeder}, title = {A splitting theorem for spaces of nonpositive curvature.}, journal = {Inventiones mathematicae}, pages = {323--328}, publisher = {mathdoc}, volume = {79}, year = {1985}, zbl = {0543.53036}, url = {http://geodesic.mathdoc.fr/item/IM_1985__79_143199/} }
Viktor Schroeder. A splitting theorem for spaces of nonpositive curvature.. Inventiones mathematicae, Tome 79 (1985), pp. 323-328. http://geodesic.mathdoc.fr/item/IM_1985__79_143199/