@article{ZVMMF_1991_31_9_a6,
     author = {B. I. Berezin and V. G. Sushko},
     title = {Small-parameter asymptotic expansions of the solution of a degenerate problem},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1338--1343},
     publisher = {mathdoc},
     volume = {31},
     number = {9},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1991_31_9_a6/}
}