TY - JOUR AU - A. I. Vahabov TI - Nonregular pencils of differential operators in a space of vector functions JO - Differencialʹnye uravneniâ PY - 1988 SP - 199 EP - 207 VL - 24 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1988_24_2_a1/ LA - ru ID - DE_1988_24_2_a1 ER -