%0 Journal Article %A G. M. Kobel'kov %T A priori estimates for elliptic equations, and iterative methods %J Doklady Akademii Nauk %D 1990 %P 1293-1296 %V 310 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1990_310_6_a1/ %G ru %F DAN_1990_310_6_a1