%0 Journal Article %A M. A. Abdrachmanov %T A priori $L_2$-estimates for the solution of an initial-boundary value problem for a system of two equations of general type that has a mixed parabolic-elliptic structure %J Differencialʹnye uravneniâ %D 1990 %P 2163-2165 %V 26 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_12_a17/ %G ru %F DE_1990_26_12_a17