@article{DAN_1989_308_2_a15,
     author = {V. F. Kravchenko and V. M. Likhachev and A. I. Stashkevich},
     title = {On an asymptotic method of solution of},
     journal = {Doklady Akademii Nauk},
     pages = {329--334},
     year = {1989},
     volume = {308},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_2_a15/}
}