@article{10_1017_S0017089508004503,
     author = {FU, XI and WANG, XIANTAO},
     title = {ISOMETRIES {AND} {DISCRETE} {ISOMETRY} {SUBGROUPS} {OF} {HYPERBOLIC} {SPACES}},
     journal = {Glasgow mathematical journal},
     pages = {31--38},
     year = {2009},
     volume = {51},
     number = {1},
     doi = {10.1017/S0017089508004503},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089508004503/}
}