Boundary of hyperbolic spaces and isometries

Question

Do you know a good reference about boundary of hyperbolic spaces (following Gromov) and the classification of the isometries acting on hyperbolic space (hyperbolic, parabolic and elliptic isometries)? I am specially interested by the hyperbolic isometries, with the notions of axis and translation length.

Answer 1

I just mention the references given by Martin:

• Sur les groupes hyperboliques d'après Mikhael Gromov, by Etienne Ghys and Pierre de la Harpe.
• Metric Spaces of Non-Positive Curvature, by Martin Bridson and André Häfliger.
• Géométrie et théorie des groupes: les groupes hyperboliques de Gromov, by Michel Coornaert, Thomas Delzant and Athanase Papadopoulos.

For my question, I found the third reference better.