1. [BGSS]G. Baumslag, S. Gersten, M. Shapiro, H. Short, Automatic groups and amalgams, Jour. of Pure and Appl. Algebra 76 (1991), 229–316.
2. [BF]M. Bestvina, M. Feighn, A combination theorem for hyperbolic groups, Jour. Diff. Geom., to appear.
3. [B]M. R. Bridson, On the geometry of normal forms in discrete groups, Proc. LMS, to appear.
4. [BG]M. R. Bridson, S. M. Gersten, The optimal isoperimetric inequality for ℤn ⋊ ℤ preprint, Princeton University, July 1992.
5. [CEHLPT]J. W. Cannon, D. B. A. Epstein, D. F. Holt, S. V. F. Levy, M. S. Paterson, W. P. Thurston, Word Processing in Groups, Jones and Bartlett, Boston MA., 1992.