TY - JOUR AU - Kh. Kh. Murtazin TI - On the point spectrum of a class of differential operators JO - Doklady Akademii Nauk PY - 1974 SP - 1322 EP - 1324 VL - 219 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1974_219_6_a11/ LA - ru ID - DAN_1974_219_6_a11 ER -