@article{10_1007_s10587_014_0102_0,
     author = {Yang, Shihai},
     title = {On geometric convergence of discrete groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {305--310},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {2014},
     doi = {10.1007/s10587-014-0102-0},
     mrnumber = {3277737},
     zbl = {06391495},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-014-0102-0/}
}