%0 Journal Article
%A Gorton, R.
%T $A$-systems
%J Compositio Mathematica
%D 1976
%P 3-13
%V 33
%N 1
%I Noordhoff International Publishing
%U http://www.numdam.org/item/CM_1976__33_1_3_0/
%G en
%F CM_1976__33_1_3_0