1. Hales, T.C.: Some algorithms arising in the proof of the Kepler conjecture, sect. 3.1.1., arXiv:math.MG/0205209
2. Hales, T.C.: A Proof of the Kepler Conjecture. Annals of Mathematics (to appear)
3. The Flyspeck Project Fact Sheet.
http://www.math.pitt.edu/~thales/flyspeck/index.html
4. Nipkow, T., Paulson, L.C., Wenzel, M.: Isabelle/HOL: A Proof Assistant for Higher-Order Logic. Springer, Heidelberg (2002)
5. Schrijver, A.: Theory of Linear and Integer Programming. Wiley & Sons, Chichester (1986)