@article{JIS_2009__12_2_a5,
     author = {Mallows, Colin},
     title = {Growing {Apollonian} packings},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_2_a5/}
}