TY - JOUR AU - A. G. Kolpakov TI - Averaging of some systems of ordinary differential equations JO - Sbornik. Mathematics PY - 1984 SP - 527 EP - 540 VL - 47 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1984_47_2_a14/ LA - en ID - SM_1984_47_2_a14 ER -