@article{10_1090_S0894_0347_2011_00691_7,
     author = {Kontorovich, Alex and Oh, Hee},
     title = {Apollonian circle packings and closed horospheres on hyperbolic 3-manifolds},
     journal = {Journal of the American Mathematical Society},
     pages = {603--648},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {2011},
     doi = {10.1090/S0894-0347-2011-00691-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2011-00691-7/}
}