@article{SM_1985_50_1_a15,
     author = {V. E. Pronchatov},
     title = {An error estimate for the averaging method in a two-frequency problem},
     journal = {Sbornik. Mathematics},
     pages = {241--258},
     year = {1985},
     volume = {50},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_50_1_a15/}
}