%0 Journal Article
%A Carvalho e Silva, Jaime
%T On the hyperbolicity of a third order operator and the generalized Goursat-Darboux problem
%J Portugaliae mathematica
%D 1989
%P 567-577
%V 46
%N S
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1989__46_S_115833/
%G en
%F PORMA_1989__46_S_115833