An inequality for circle packings proved by semidefinite programming

@article{Parrilo and Peretz:2004,
author = {P. A. Parrilo, R. Peretz},
journal = {Discrete and Computational Geometry},
month = {February},
pages = {357--367},
title = {An inequality for circle packings proved by semidefinite programming},
volume = {31},
year = {2004}
}