TY  - JOUR
AU  - V. Schroeder
AU  - M.T. Anderson
TI  - Existence of flats in manifolds of nonpositive curvature.
JO  - Inventiones mathematicae
PY  - 1986
SP  - 303
EP  - 316
VL  - 85
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1986__85_143370/
ID  - IM_1986__85_143370
ER  -