@article{DE_1973_9_10_a10,
     author = {V. N. Gol'dberg},
     title = {The question whether nonlinear mixed problems for almost linear hyperbolic systems in the plane are well posed},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1831--1844},
     publisher = {mathdoc},
     volume = {9},
     number = {10},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_10_a10/}
}