@article{urn:eudml:doc:42274, title = {A characterization of Gromov hyperbolicity of surfaces with variable negative curvature.}, journal = {Publicacions Matem\`atiques}, volume = {53}, year = {2009}, pages = {83-110}, zbl = {1153.53320}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:42274} }
Portilla, A.; Tourís, E. A characterization of Gromov hyperbolicity of surfaces with variable negative curvature.. Publicacions Matemàtiques, Tome 53 (2009) pp. 83-110. http://gdmltest.u-ga.fr/item/urn:eudml:doc:42274/