1. Hyperbolic Groups
2. Bonk, M., Heinonen, J. and Koskela, P. (2001) Uniformizing Gromov Hyperbolic Spaces. Asterisque Société Mathématique de France, Paris, 270.
3. Elements of Asymptotic Geometry
4. Gromov hyperbolic spaces
5. Uniform domains and the quasi-hyperbolic metric