%0 Journal Article
%A G. M. Vainikko
%T Compact approximation of operators and approximate solution of operator equations
%J Doklady Akademii Nauk
%D 1969
%P 237-240
%V 189
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_189_2_a2/
%G ru
%F DAN_1969_189_2_a2