TY - JOUR AU - Yu. A. Konyaev TI - Sequential analysis of periodic systems with a small parameter multiplying the derivative in the presence of purely imaginary (including identically multiple) points in the spectrum of the limit operator JO - Differencialʹnye uravneniâ PY - 1985 SP - 1085 EP - 1089 VL - 21 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1985_21_6_a25/ LA - ru ID - DE_1985_21_6_a25 ER -