TY - JOUR AU - V. L. Rabtsevich TI - Reducibility of formal differential systems JO - Differencialʹnye uravneniâ PY - 1983 SP - 1884 EP - 1889 VL - 19 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1983_19_11_a7/ LA - ru ID - DE_1983_19_11_a7 ER -