@article{DAN_1963_149_2_a22,
     author = {B. L. Livshits},
     title = {Calculation of frequencies and shapes of normal molecular vibrations by the perturbation method},
     journal = {Doklady Akademii Nauk},
     pages = {305--307},
     publisher = {mathdoc},
     volume = {149},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_2_a22/}
}