%0 Journal Article %A A. M. Nakhushev %T The Darboux problem for degenerate hyperbolic equations %J Differencialʹnye uravneniâ %D 1971 %P 49-56 %V 7 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_1_a5/ %G ru %F DE_1971_7_1_a5