TY  - JOUR
AU  - Bryant, Robert L.
AU  - Griffiths, Phillip A.
TI  - Characteristic cohomology of differential systems. I. General theory
JO  - Journal of the American Mathematical Society
PY  - 1995
SP  - 507
EP  - 596
VL  - 08
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1995-1311820-X/
DO  - 10.1090/S0894-0347-1995-1311820-X
ID  - 10_1090_S0894_0347_1995_1311820_X
ER  -