@article{DE_1986_22_4_a4,
     author = {N. I. Imranov},
     title = {Boundary value problems for degenerate differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {600--607},
     year = {1986},
     volume = {22},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_4_a4/}
}