%0 Journal Article %A V. A. Kozlov %A V. G. Maz'ya %T Iterative procedures for solving ill-posed boundary value problems that preserve the differential equations %J Algebra i analiz %D 1989 %P 144-170 %V 1 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_1989_1_5_a5/ %G ru %F AA_1989_1_5_a5