%0 Journal Article %A F. T. Baranovskii %T The Goursat problem for a second order hyperbolic equation with a singularity in the coefficient %J Differencialʹnye uravneniâ %D 1977 %P 2234-2245 %V 13 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_12_a13/ %G ru %F DE_1977_13_12_a13