%0 Journal Article %A V. N. Gol'dberg %T On discontinuous solutions of nonlinear mixed problems for almost linear hyperbolic systems in the plane %J Doklady Akademii Nauk %D 1974 %P 253-256 %V 214 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1974_214_2_a3/ %G ru %F DAN_1974_214_2_a3