@article{DE_1971_7_10_a3,
     author = {V. V. Gudkov and A. Ya. Lepin},
     title = {The solvability of certain boundary value problems for a second order ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1779--1788},
     publisher = {mathdoc},
     volume = {7},
     number = {10},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a3/}
}