%0 Journal Article
%A V. K. Romanko
%T Eigenvalues of boundary value problems for certain equations which change type
%J Differencialʹnye uravneniâ
%D 1983
%P 1759-1764
%V 19
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_10_a11/
%G ru
%F DE_1983_19_10_a11