@article{DAN_1962_145_4_a0,
     author = {D. V. Anosov},
     title = {Roughness of geodesic flows on compact {Riemannian} manifolds of negative curvature},
     journal = {Doklady Akademii Nauk},
     pages = {707--709},
     year = {1962},
     volume = {145},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a0/}
}