%0 Journal Article %A L. K. Astaf'eva %T A nonlinear boundary value problem for an equation of mixed type %J Trudy seminara po kraevym zadačam %D 1984 %P 32-39 %V 21 %N 21 %I mathdoc %U http://geodesic.mathdoc.fr/item/KUKZ_1984_21_21_a3/ %G ru %F KUKZ_1984_21_21_a3