@article{DAN_1965_165_3_a6,
     author = {A. N. Filatov},
     title = {On the method of averaging in systems of integro-differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {490--492},
     publisher = {mathdoc},
     volume = {165},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_3_a6/}
}