%0 Journal Article %A V. V. Kovrizhkin %T Smoothness of the solutions of the generalized Tricomi problem %J Differencialʹnye uravneniâ %D 1973 %P 97-105 %V 9 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_1_a9/ %G ru %F DE_1973_9_1_a9