@article{DAN_1966_166_5_a18,
     author = {M. A. El'yashevich and L. A. Gribov},
     title = {Natural coordinates, exact and approximate, in the oscillation theory of polyatomic molecules},
     journal = {Doklady Akademii Nauk},
     pages = {1080--1083},
     publisher = {mathdoc},
     volume = {166},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_166_5_a18/}
}