%0 Journal Article %A R. K. Tagiyev %T An estimate for the rate of convergence of difference approximations and regularization of a problem of optimal control for a second-order differential equation %J Differencialʹnye uravneniâ %D 1989 %P 1626-1629 %V 25 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1989_25_9_a26/ %G ru %F DE_1989_25_9_a26