%0 Journal Article
%A Cardoso, Fernando
%A Trèves, François
%T A necessary condition of local solvability for pseudo-differential equations with double characteristics
%J Annales de l'Institut Fourier
%D 1974
%P 225-292
%V 24
%N 1
%I Institut Fourier
%C Grenoble
%U https://aif.centre-mersenne.org/articles/10.5802/aif.499/
%R 10.5802/aif.499
%G en
%F AIF_1974__24_1_225_0