TY - JOUR AU - S. V. Petras TI - Continuous dependence of poles of the scattering matrix on coefficients of an elliptic operator JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1983 SP - 132 EP - 136 VL - 159 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_1983_159_a7/ LA - ru ID - TM_1983_159_a7 ER -