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@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/} }
A. Ya. Lepin. The solvability of boundary value problems on small intervals. Differencialʹnye uravneniâ, Tome 14 (1978) no. 3, pp. 548-550. http://geodesic.mathdoc.fr/item/DE_1978_14_3_a20/