%0 Journal Article %A T. V. Chekmarev %T The Tricomi problem for a model system of equations in domains of special forms %J Differencialʹnye uravneniâ %D 1990 %P 860-872 %V 26 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_5_a14/ %G ru %F DE_1990_26_5_a14