@article{DE_1978_14_3_a20,
     author = {A. Ya. Lepin},
     title = {The solvability of boundary value problems on small intervals},
     journal = {Differencialʹnye uravneni\^a},
     pages = {548--550},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_3_a20/}
}