TY - JOUR AU - V. P. Maslov TI - Perturbation theory for the multidimensional Schr\"odinger equation JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1961 VL - 16 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1961_16_3_a21/ LA - ru ID - RM_1961_16_3_a21 ER -