TY  - JOUR
AU  - Vlad Sergiescu
AU  - Peter Greenberg
TI  - An acyclic extension of the braid group.
JO  - Commentarii mathematici Helvetici
PY  - 1991
SP  - 109
EP  - 138
VL  - 66
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140225/
ID  - CMH_1991__66_4_140225
ER  -