@article{GDZPPN002317060, title = {Conditions under which a Geodesic Flow is Anosov.}, journal = {Mathematische Annalen}, volume = {243}, year = {1979}, pages = {103-114}, zbl = {0382.58017}, url = {http://dml.mathdoc.fr/item/GDZPPN002317060} }
Bolton, J. Conditions under which a Geodesic Flow is Anosov.. Mathematische Annalen, Tome 243 (1979) pp. 103-114. http://gdmltest.u-ga.fr/item/GDZPPN002317060/