@article{DE_1965_1_5_a6,
     author = {M. V. Fedoryuk},
     title = {The one-dimensional scattering problem in the quasi-classical approximation. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {631--646},
     publisher = {mathdoc},
     volume = {1},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_5_a6/}
}