@article{DE_1968_4_7_a0,
     author = {A. Ya. Lepin and A. D. Myshkis},
     title = {The existence of a solution of a certain nonlinear boundary value problem for an $n$th-order ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1171--1183},
     publisher = {mathdoc},
     volume = {4},
     number = {7},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_7_a0/}
}