@article{DAN_1988_298_6_a14,
     author = {A. L. \v{S}taras},
     title = {The averaging method for weakly nonlinear equations},
     journal = {Doklady Akademii Nauk},
     pages = {1345--1348},
     publisher = {mathdoc},
     volume = {298},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_6_a14/}
}