TY  - JOUR
AU  - Cardoso, Fernando
AU  - Trèves, François
TI  - A necessary condition of local solvability for pseudo-differential equations with double characteristics
JO  - Annales de l'Institut Fourier
PY  - 1974
SP  - 225
EP  - 292
VL  - 24
IS  - 1
PB  - Institut Fourier
PP  - Grenoble
UR  - http://www.numdam.org/articles/10.5802/aif.499/
DO  - 10.5802/aif.499
LA  - en
ID  - AIF_1974__24_1_225_0
ER  -