@article{10_4153_CMB_1972_061_8,
     author = {Boyd, David W.},
     title = {Disk {Packings} which have {Non-Extreme} {Exponents}},
     journal = {Canadian mathematical bulletin},
     pages = {341--344},
     year = {1972},
     volume = {15},
     number = {3},
     doi = {10.4153/CMB-1972-061-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-061-8/}
}