%0 Journal Article
%A Vlad Sergiescu
%A Peter Greenberg
%T An acyclic extension of the braid group.
%J Commentarii mathematici Helvetici
%D 1991
%P 109-138
%V 66
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140225/
%F CMH_1991__66_4_140225