Open access peer-reviewed chapter
By Jose M. Varela, Francisco J. Medrano, Eduardo Dei-Cas and Enrique J. Calderón
Submitted: November 6th 2010Reviewed: April 26th 2011Published: October 21st 2011
© 2011 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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