%0 Journal Article %A M. H. Abregov %T Some problems of the type of the Bicadze--Samarski{\v\i} problem for a certain equation of mixed type %J Differencialʹnye uravneniâ %D 1974 %P 3-6 %V 10 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1974_10_1_a0/ %G ru %F DE_1974_10_1_a0