@article{DE_1984_20_8_a3,
     author = {A. S. Galiullin},
     title = {Invariance of action and inverse problems of dynamics},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1318--1325},
     publisher = {mathdoc},
     volume = {20},
     number = {8},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_8_a3/}
}