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@article{IM_1986__85_143370, author = {V. Schroeder and M.T. Anderson}, title = {Existence of flats in manifolds of nonpositive curvature.}, journal = {Inventiones mathematicae}, pages = {303--316}, publisher = {mathdoc}, volume = {85}, year = {1986}, zbl = {0615.53030}, url = {http://geodesic.mathdoc.fr/item/IM_1986__85_143370/} }
V. Schroeder; M.T. Anderson. Existence of flats in manifolds of nonpositive curvature.. Inventiones mathematicae, Tome 85 (1986), pp. 303-316. http://geodesic.mathdoc.fr/item/IM_1986__85_143370/