Miscellaneous Papers

1. Open problems in combinatorial group theory. Second edition (with G. Baumslag and V. Shpilrain). Combinatorial and geometric group theory (New York, 2000/Hoboken, NJ, 2001), 1-38, Contemp. Math., 296, Amer. Math. Soc., Providence, RI, 2002.

2. Centroids of groups (with S. Lioutikov). J. Group Theory, 3 (2000), no. 2, 177-197.

3. Open problems in combinatorial group theory (with G. Baumslag and V. Shpilrain). Groups, languages and geometry (South Hadley, MA, 1998), 1-27, Contemp. Math., 250, Amer. Math. Soc., Providence, RI, 1999.