@article{MT_1989_14_a9,
     author = {V. A. Sharafutdinov},
     title = {Ray transformation of symmetric tensor fields},
     journal = {Matemati\v{c}eskie trudy},
     pages = {221--245},
     publisher = {mathdoc},
     volume = {14},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1989_14_a9/}
}