%0 Journal Article
%A Yu. K. Lando
%T The $F$-index and $F$-normal solvability of integro-differential operators
%J Differencialʹnye uravneniâ
%D 1969
%P 546-555
%V 5
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_3_a14/
%G ru
%F DE_1969_5_3_a14