%0 Journal Article
%A Enrique R. Pujals
%A Martín Sambarino
%T Homoclinic tangencies and hyperbolicity for surface diffeomorphisms
%J Annals of mathematics
%D 2000
%V 151
%N 3
%U http://geodesic.mathdoc.fr/articles/10.2307/121127/
%R 10.2307/121127
%F 10_2307_121127