TY - JOUR AU - E. G. Belaga TI - The reducibility of a system of ordinary differential equations in the neighborhood of a conditionally periodic motion JO - Doklady Akademii Nauk PY - 1962 SP - 255 EP - 258 VL - 143 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a0/ LA - ru ID - DAN_1962_143_2_a0 ER -