%0 Journal Article %A V. A. Eleev %A S. K. Kumykova %A V. N. Lesev %T On problems of the type of the Bitsadze-Samarsky problem for mixed equations with perpendicular lines of degeneracy %J News of the Kabardin-Balkar scientific center of RAS %D 2000 %P 35-40 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IZKAB_2000_1_a2/ %G ru %F IZKAB_2000_1_a2