@article{DE_1986_22_9_a9,
     author = {B. L. Shekhter},
     title = {A boundary value problem of periodic type for a second-order nonlinear ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1551--1556},
     publisher = {mathdoc},
     volume = {22},
     number = {9},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a9/}
}