%0 Journal Article %A F. V. Lubyshev %T The accuracy of difference approximations and the regularization of optimal control problems for an elliptic equation with controls in the coefficients %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1989 %P 1431-1433 %V 29 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1989_29_9_a17/ %G ru %F ZVMMF_1989_29_9_a17