%0 Journal Article %A N. V. Zhitarashu %T Isomorphism theorems in the $L_2$-theory of weak solutions of parabolic boundary value problems %J Doklady Akademii Nauk %D 1981 %P 1054-1058 %V 260 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a6/ %G ru %F DAN_1981_260_5_a6