@article{DE_1968_4_10_a8,
     author = {M. V. Fedoryuk},
     title = {Analytic properties of the scattering amplitude in the one-dimensional case. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1842--1853},
     publisher = {mathdoc},
     volume = {4},
     number = {10},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_10_a8/}
}