@article{DE_1976_12_7_a17,
     author = {G. M. Buldyk},
     title = {A remark on the number of {Ljapunov} constants for conditions for a center of a certain differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1301--1302},
     publisher = {mathdoc},
     volume = {12},
     number = {7},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_7_a17/}
}