Open access peer-reviewed chapter
By Adrián Poblano and Carmina Arteaga
Submitted: March 8th 2011Reviewed: August 10th 2011Published: March 30th 2012
© 2012 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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