@article{DE_1989_25_12_a4,
     author = {S. A. Brykalov},
     title = {A nonlinear boundary value problem with break points of solutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2066--2075},
     publisher = {mathdoc},
     volume = {25},
     number = {12},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_12_a4/}
}