@article{DAN_1961_138_6_a16,
     author = {G. I. Gurevich},
     title = {Theory of small amplitude vibrations},
     journal = {Doklady Akademii Nauk},
     pages = {1313--1316},
     publisher = {mathdoc},
     volume = {138},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_6_a16/}
}