%0 Journal Article %A L. M. Nevostruev %T Darboux problems for hyperbolic equations with degeneration of type and order %J Differencialʹnye uravneniâ %D 1987 %P 1780-1786 %V 23 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_10_a14/ %G ru %F DE_1987_23_10_a14