%0 Journal Article
%A I. M. Koval'chik
%T Linear equations with functional derivatives
%J Doklady Akademii Nauk
%D 1970
%P 763-766
%V 194
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_194_4_a6/
%G ru
%F DAN_1970_194_4_a6