%0 Journal Article %A M. I. Sumin %T On ill-posed problems, extremals of the Tikhonov functional and the regularized Lagrange principles %J Vestnik rossijskih universitetov. Matematika %D 2022 %P 58-79 %V 27 %N 137 %I mathdoc %U http://geodesic.mathdoc.fr/item/VTAMU_2022_27_137_a4/ %G ru %F VTAMU_2022_27_137_a4