%0 Journal Article
%A C. Bardos
%A G. Lebeau
%A J. Rauch
%T Scattering frequencies and Gevrey 3 singularities.
%J Inventiones mathematicae
%D 1987
%P 77-114
%V 90
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1987__90_143501/
%F IM_1987__90_143501