@article{DE_1991_27_11_a8,
     author = {M. Yu. Yunusov},
     title = {A problem on the conjugation of equations with a small parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1925--1935},
     year = {1991},
     volume = {27},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_11_a8/}
}