@article{DAN_1987_295_6_a7,
     author = {L. N. Pestov and V. A. Sharafutdinov},
     title = {Integral geometry of tensor fields on a manifold of negative},
     journal = {Doklady Akademii Nauk},
     pages = {1318--1320},
     year = {1987},
     volume = {295},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_6_a7/}
}