TY - JOUR AU - E. M. Il'in TI - Scattering by unbounded obstacles for second-order elliptic operators JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1988 SP - 80 EP - 101 VL - 179 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_1988_179_a5/ LA - ru ID - TM_1988_179_a5 ER -