%0 Journal Article
%A E. G. D'yakonov
%T On approximate methods for the solution of operator equations
%J Doklady Akademii Nauk
%D 1971
%P 516-519
%V 198
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_198_3_a6/
%G ru
%F DAN_1971_198_3_a6