@article{10_4007_annals_2010_172_761,
     author = {Gonzalo Contreras},
     title = {Geodesic flows with positive topological entropy, twist maps and hyperbolicity},
     journal = {Annals of mathematics},
     pages = {761--808},
     publisher = {mathdoc},
     volume = {172},
     number = {2},
     year = {2010},
     doi = {10.4007/annals.2010.172.761},
     mrnumber = {2680482},
     zbl = {1204.37032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2010.172.761/}
}