@article{DE_1994_30_3_a23,
     author = {V. S. Medvedev and E. L. Fedorov},
     title = {Calculation of the second {Mel{\textquoteright}nikov} parameter (autonomous case)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {533},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_3_a23/}
}