%0 Journal Article
%A A. I. Polak
%T On sufficient and necessary conditions for complete approximative solvability of equations of a very general nature
%J Doklady Akademii Nauk
%D 1957
%P 587-590
%V 112
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_112_4_a5/
%G ru
%F DAN_1957_112_4_a5