@article{DAN_1969_187_6_a1,
     author = {V. Sh. Burd and P. P. Zabreiko and Yu. S. Kolesov and M. A. Krasnosel'skii},
     title = {The averaging principle and bifurcation of almost periodic solutions},
     journal = {Doklady Akademii Nauk},
     pages = {1219--1221},
     publisher = {mathdoc},
     volume = {187},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_6_a1/}
}