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This code was originally implemented for:
"q-state Potts model metastability study using optimized GPU-based Monte Carlo algorithms",
Ezequiel E. Ferrero, Juan Pablo De Francesco, Nicolás Wolovick, Sergio A. Cannas
http://arxiv.org/abs/1101.0876
Computer Physics Communications Volume 183, Issue 8, August 2012, Pages 1578–1587
http://dx.doi.org/10.1016/j.cpc.2012.02.026

The code is freely available under GNU GPL v3.

Version 1.1:
- Added the CPU version. Minor code cleanups.

Version 1.0:
- Original release used in the article.