%0 Journal Article %A S. L. Edelstein %T Operator analogs of VKB-type estimates and the solvability of boundary-value problems %J Matematičeskie zametki %D 1992 %P 124-131 %V 51 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1992_51_4_a16/ %G ru %F MZM_1992_51_4_a16