Open access peer-reviewed chapter
By Karina Portillo Carroz and Josep Morera
Submitted: April 19th 2011Reviewed: August 24th 2011Published: February 29th 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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