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References
editMost of my references are to de la Harpe--Ghys because this is where I learned the theory. On the other hand it is in French and a bit old so if somebody wants to add references to Bridson--Haefliger of the Väisälä paper (which I am not familiar with) it could be good. jraimbau 18:09, 1 July 2016 (UTC) — Preceding unsigned comment added by Jean Raimbault (talk • contribs)