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@article{MM2_1991__72_1_155641, author = {Marc Troynaov}, title = {The {Schwarz} {Lemma} for nonpositively curved riemannian surfaces.}, journal = {Manuscripta mathematica}, pages = {251--256}, publisher = {mathdoc}, volume = {72}, number = {1}, year = {1991}, zbl = {0736.53043}, url = {http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155641/} }
Marc Troynaov. The Schwarz Lemma for nonpositively curved riemannian surfaces.. Manuscripta mathematica, Tome 72 (1991) no. 1, pp. 251-256. http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155641/