@article{GDZPPN002101289,
title = {A splitting theorem for spaces of nonpositive curvature.},
journal = {Inventiones mathematicae},
volume = {82},
year = {1985},
pages = {323-328},
zbl = {0543.53036},
url = {http://dml.mathdoc.fr/item/GDZPPN002101289}
}
Schroeder, Viktor. A splitting theorem for spaces of nonpositive curvature.. Inventiones mathematicae, Tome 82 (1985) pp. 323-328. http://gdmltest.u-ga.fr/item/GDZPPN002101289/