%0 Journal Article
%A Yu. K. Lando
%T The index and the normal solvability of integro-differential operators
%J Differencialʹnye uravneniâ
%D 1968
%P 1112-1126
%V 4
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1968_4_6_a15/
%G ru
%F DE_1968_4_6_a15