TY - JOUR AU - I. S. Lomov TI - Small denominators in the analytic theory of degenerate differential equations JO - Differencialʹnye uravneniâ PY - 1993 SP - 2079 EP - 2089 VL - 29 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1993_29_12_a4/ LA - ru ID - DE_1993_29_12_a4 ER -