%0 Journal Article
%A A. B. Budak
%T Expansion in eigenfunctions of a fourth-order differential operator with a piecewise constant leading coefficient
%J Differencialʹnye uravneniâ
%D 1980
%P 1545-1558
%V 16
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_9_a1/
%G ru
%F DE_1980_16_9_a1