%0 Journal Article
%A V. N. Pyvovarchyk
%T The discrete spectrum of a problem connected with wave propagation in an inhomogeneous medium with viscous friction
%J Differencialʹnye uravneniâ
%D 1987
%P 1533-1538
%V 23
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_9_a6/
%G ru
%F DE_1987_23_9_a6