@article{DE_1998_34_5_a4,
     author = {Yu. V. Pokorny and O. M. Penkin and V. L. Pryadiev},
     title = {A nonlinear boundary value problem on a graph},
     journal = {Differencialʹnye uravneni\^a},
     pages = {629--637},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_5_a4/}
}