@ARTICLE{hales-revision,
author = "Thomas C. Hales and John Harrison and Sean
McLaughlin and Tobias Nipkow and Steven Obua and
Roland Zumkeller",
title = "A Revision of the Proof of the {K}epler Conjecture",
journal = "Discrete and Computational Geometry",
year = 2009,
note = "Available online at
{\url{http://dx.doi.org/10.1007/s00454-009-9148-4}}"}