@article{DE_1969_5_8_a4,
     author = {A. Ya. Lepin},
     title = {Application of topological methods to nonlinear boundary value problems for ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1390--1397},
     publisher = {mathdoc},
     volume = {5},
     number = {8},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_8_a4/}
}