@article{DAN_1969_184_3_a4,
     author = {P. P. Zabreiko and Yu. S. Kolesov and M. A. Krasnosel'skii},
     title = {Implicit functions and the averaging principle of {N.\,N.~Bogoljubov} and {N.\,M.~Krylov}},
     journal = {Doklady Akademii Nauk},
     pages = {526--529},
     publisher = {mathdoc},
     volume = {184},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_3_a4/}
}