@article{GDZPPN002104458, title = {Scattering frequencies and Gevrey 3 singularities.}, journal = {Inventiones mathematicae}, volume = {88}, year = {1987}, pages = {77-114}, zbl = {0723.35058}, url = {http://dml.mathdoc.fr/item/GDZPPN002104458} }
Bardos, C.; Lebeau, G.; Rauch, J. Scattering frequencies and Gevrey 3 singularities.. Inventiones mathematicae, Tome 88 (1987) pp. 77-114. http://gdmltest.u-ga.fr/item/GDZPPN002104458/