%0 Journal Article
%A Michael Barr
%T On subgroups of the Lambek pregroup
%J Theory and applications of categories
%D 2004
%P 262-269
%V 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TAC_2004_12_a7/
%G en
%F TAC_2004_12_a7