@article{ZVMMF_1984_24_9_a4,
     author = {V. F. Butuzov and A. G. Nikitin},
     title = {Singularly disturbed elliptic boundary value problem in a~rectangle in the critical case},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1320--1330},
     publisher = {mathdoc},
     volume = {24},
     number = {9},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1984_24_9_a4/}
}