@article{DAN_1976_226_4_a8,
     author = {Ya. B. Pesin},
     title = {Ljapunov characteristic exponents and ergodic properties of smooth dynamical systems with an invariant measure},
     journal = {Doklady Akademii Nauk},
     pages = {774--777},
     publisher = {mathdoc},
     volume = {226},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_4_a8/}
}