@article{DE_1967_3_11_a3,
     author = {A. Ya. Lepin and A. D. Myshkis},
     title = {An approach to nonlinear boundary value problems for ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1882--1888},
     publisher = {mathdoc},
     volume = {3},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a3/}
}