TY - JOUR AU - A. M. Il'in TI - On the two-scale method for the problem of perturbed one-frequency oscillations JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1999 SP - 383 EP - 389 VL - 118 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1999_118_3_a7/ LA - ru ID - TMF_1999_118_3_a7 ER -