@article{10_1090_S0894_0347_1991_1096169_1,
     author = {Bestvina, Mladen and Mess, Geoffrey},
     title = {The boundary of negatively curved groups},
     journal = {Journal of the American Mathematical Society},
     pages = {469--481},
     publisher = {mathdoc},
     volume = {04},
     number = {3},
     year = {1991},
     doi = {10.1090/S0894-0347-1991-1096169-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1991-1096169-1/}
}