@article{DE_1965_1_3_a11,
     author = {M. D. Kocheva},
     title = {On vibrations of a double pendulum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {374--386},
     publisher = {mathdoc},
     volume = {1},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_3_a11/}
}