TY  - JOUR
AU  - Nacinovich, Mauro
TI  - On the absence of Poincaré lemma for some systems of partial differential equations
JO  - Compositio Mathematica
PY  - 1981
SP  - 241
EP  - 303
VL  - 44
IS  - 1-3
PB  - Sijthoff et Noordhoff International Publishers
UR  - http://archive.numdam.org/item/CM_1981__44_1-3_241_0/
LA  - en
ID  - CM_1981__44_1-3_241_0
ER  -