@article{TMF_1999_118_3_a7,
     author = {A. M. Il'in},
     title = {On the two-scale method for the problem of perturbed one-frequency oscillations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {383--389},
     publisher = {mathdoc},
     volume = {118},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_118_3_a7/}
}