@article{DE_1984_20_4_a16,
     author = {\'E. A. Polyanskii},
     title = {Approximation of the solution of the {Helmholtz} equation by the solution of an equation of {Schr\"odinger} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {695--706},
     year = {1984},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_4_a16/}
}