@article{MAN_1979__240_163233,
     author = {J. Bolton},
     title = {Conditions under which a {Geodesic} {Flow} is {Anosov.}},
     journal = {Mathematische Annalen},
     pages = {103--114},
     publisher = {mathdoc},
     volume = {240},
     year = {1979},
     zbl = {0382.58017},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__240_163233/}
}