1. J.P. Serre, Trees (Springer Verlag 1978).
  2. M. Bridson, A. Haefliger, Metric Spaces of Non-positive Curvature, Part III (Springer, 1999), Chapters I.8, III.H.1, III. Γ 5.
  3. H. Short et al., 'Notes on word hyperbolic groups', Group Theory from a Geometrical Viewpoint, Proc. ICTP Trieste (eds E. Ghys, A. Haefliger, A. Verjovsky, World Scientific 1990)
  4. C.F. Miller, Combinatorial Group Theory, notes
Further Reading:
  1. G. Baumslag, Topics in Combinatorial Group Theory (Birkhauser, 1993).
  2. O. Bogopolski, Introduction to Group Theory (EMS Textbooks in Mathematics, 2008).
  3. R. Lyndon, P. Schupp, Combinatorial Group Theory (Springer, 2001).
  4. W. Magnus, A. Karass, D. Solitar,Combinatorial Group Theory: Presentations of Groups in Terms of Generators and Relations (Dover Publications, 2004).
  5. P. de la Harpe, Topics in Geometric Group Theory, (University of Chicago Press, 2000).
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