TY - JOUR AU - Yu. K. Lando AU - S. V. Yashchuk TI - On conditionally solvable integro-differential operators JO - Differencialʹnye uravneniâ PY - 1987 SP - 902 EP - 904 VL - 23 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1987_23_5_a26/ LA - ru ID - DE_1987_23_5_a26 ER -