%0 Journal Article
%A Nacinovich, Mauro
%T On the absence of Poincaré lemma for some systems of partial differential equations
%J Compositio Mathematica
%D 1981
%P 241-303
%V 44
%N 1-3
%I Sijthoff et Noordhoff International Publishers
%U http://www.numdam.org/item/CM_1981__44_1-3_241_0/
%G en
%F CM_1981__44_1-3_241_0