@article{GDZPPN000366323,
title = {Second Derivatives of Circle Packings and Conformai Mappings.},
journal = {Discrete \& computational geometry},
volume = {11},
year = {1994},
pages = {35-50},
zbl = {0794.30006},
url = {http://dml.mathdoc.fr/item/GDZPPN000366323}
}
Rodin, B.; He, Zheng-Xu; Doyle, P. Second Derivatives of Circle Packings and Conformai Mappings.. Discrete & computational geometry, Tome 11 (1994) pp. 35-50. http://gdmltest.u-ga.fr/item/GDZPPN000366323/