TY - JOUR AU - A. A. Laptev TI - Spectral asymptotics of a composition of pseudodifferential operators and reflections from the boundary JO - Doklady Akademii Nauk PY - 1977 SP - 800 EP - 803 VL - 236 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1977_236_4_a4/ LA - ru ID - DAN_1977_236_4_a4 ER -