@article{DAN_1983_271_5_a19,
     author = {N. E. Maltsev},
     title = {A modification of the {WKB} method},
     journal = {Doklady Akademii Nauk},
     pages = {1108--1111},
     year = {1983},
     volume = {271},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_271_5_a19/}
}