@article{AFM_1995_20_2_a9,
     author = {Eric M. Freden},
     title = {Negatively curved groups have the convergence property {I}},
     journal = {Annales Fennici Mathematici},
     pages = {333--348},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1995_20_2_a9/}
}