@article{1178228075, author = {Uesu, Kagumi}, title = {Hadamard manifolds and the visibility axiom}, journal = {Tohoku Math. J. (2)}, volume = {40}, number = {4}, year = {1988}, pages = { 27-34}, language = {en}, url = {http://dml.mathdoc.fr/item/1178228075} }
Uesu, Kagumi. Hadamard manifolds and the visibility axiom. Tohoku Math. J. (2), Tome 40 (1988) no. 4, pp. 27-34. http://gdmltest.u-ga.fr/item/1178228075/