%0 Journal Article %A A. V. Bayev %T Application of the Lagrange principle in the problem of optimal inversion of linear operators in the case of sourcewise representability of the exact solutions to operator equations %J Numerical methods and programming %D 2007 %P 20-28 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMP_2007_8_1_a3/ %G ru %F VMP_2007_8_1_a3