TY - JOUR AU - A. V. Pechenev TI - Averaging of systems with hierarchy of phase rotation speeds on JO - Doklady Akademii Nauk PY - 1990 SP - 28 EP - 31 VL - 315 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a4/ LA - ru ID - DAN_1990_315_1_a4 ER -