%0 Journal Article
%A A. I. Nosich
%A A. E. Poedinchuk
%A V. P. Shestopalov
%T The existence of a discrete spectrum and waves of singular type in
%J Doklady Akademii Nauk
%D 1987
%P 587-591
%V 293
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_293_3_a17/
%G ru
%F DAN_1987_293_3_a17