TY - JOUR AU - M. A. Shubin TI - Pseudodifference operators and their inversion JO - Doklady Akademii Nauk PY - 1984 SP - 567 EP - 570 VL - 276 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1984_276_3_a12/ LA - ru ID - DAN_1984_276_3_a12 ER -