@article{00902742,
title = {Negatively curved groups have the convergence property. I.},
journal = {Annales Academiae Scientiarum Fennicae. Mathematica},
volume = {20},
year = {1995},
pages = {333-348},
zbl = {0847.20031},
language = {en},
url = {http://dml.mathdoc.fr/item/00902742}
}
Freden, Eric M. Negatively curved groups have the convergence property. I.. Annales Academiae Scientiarum Fennicae. Mathematica, Tome 20 (1995) pp. 333-348. http://gdmltest.u-ga.fr/item/00902742/