@article{DCG_1994__11_3_131287,
     author = {B. Rodin and Zheng-Xu He and P. Doyle},
     title = {Second {Derivatives} of {Circle} {Packings} and {Conformai} {Mappings.}},
     journal = {Discrete & computational geometry},
     pages = {35--50},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1994},
     zbl = {0794.30006},
     url = {http://geodesic.mathdoc.fr/item/DCG_1994__11_3_131287/}
}