@article{DAN_1970_195_3_a4,
     author = {V. N. Gol'dberg},
     title = {Discontinuous solutions of nonlinear mixed problems for almost linear hyperbolic systems on the plane},
     journal = {Doklady Akademii Nauk},
     pages = {532--535},
     publisher = {mathdoc},
     volume = {195},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_3_a4/}
}