1. Generalized free products of linear groups;Proc. Lond. Math. Soc. (3),1973
2. Braid groups are linear;Ann. of Math. (2),2002
3. Braid groups are linear;J. Amer. Math. Soc.,2001
4. A 3-manifold group which is not four dimensional linear;J. Pure Appl. Algebra,2014
5. The automorphism group of a free group is not a CAT(0){\rm CAT}(0) group;Proc. Amer. Math. Soc.,1994