@article{01529483, title = {Homoclinic tangencies and hyperbolicity for surface diffeomorphisms.}, journal = {Annals of Mathematics. Second Series}, volume = {151}, year = {2000}, pages = {961-1023}, doi = {10.2307/121127}, zbl = {0959.37040}, language = {en}, url = {http://dml.mathdoc.fr/item/01529483} }
Pujals, Enrique R.; Sambarino, Martín. Homoclinic tangencies and hyperbolicity for surface diffeomorphisms.. Annals of Mathematics. Second Series, Tome 151 (2000) pp. 961-1023. doi : 10.2307/121127. http://gdmltest.u-ga.fr/item/01529483/