%0 Journal Article
%A L. Tepoyan
%T Fourth-order degenerate operator-differential equations
%J Differencialʹnye uravneniâ
%D 1987
%P 1366-1376
%V 23
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_8_a9/
%G ru
%F DE_1987_23_8_a9