@article{DE_1976_12_4_a11,
     author = {V. N. Gol'dberg},
     title = {The branching of the solutions of mixed problems for almost linear hyperbolic systems of the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {686--699},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a11/}
}