@article{DE_1977_13_11_a20,
     author = {A. Ya. Lepin},
     title = {Sufficient conditions for the solvability of a certain boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2082--2083},
     publisher = {mathdoc},
     volume = {13},
     number = {11},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a20/}
}