@article{10_1017_S0017089501030063,
     author = {Coornaert, Michel and Papadopoulos, Athanase},
     title = {Horofunctions and symbolic dynamics on {Gromov} hyperbolic groups},
     journal = {Glasgow mathematical journal},
     pages = {425--456},
     year = {2001},
     volume = {43},
     number = {3},
     doi = {10.1017/S0017089501030063},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089501030063/}
}