%0 Journal Article %A V. P. Maslov %T Perturbation theory for the multidimensional Schrödinger equation %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1961 %V 16 %N 3 %U http://geodesic.mathdoc.fr/item/RM_1961_16_3_a21/ %G ru %F RM_1961_16_3_a21