@article{RM_1961_16_3_a21,
     author = {V. P. Maslov},
     title = {Perturbation theory for the multidimensional {Schr\"odinger} equation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_3_a21/}
}