@article{DE_1972_8_5_a9,
     author = {M. V. Fedoryuk},
     title = {Asymptotic behavior of the eigenvalues and eigenfunctions of the {Sturm--Liouville} operator with a complex-valued polynomial {potential.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {811--816},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_5_a9/}
}