Open access peer-reviewed chapter
By Miguel Ángel García Cabezas and Bárbara Fernández Valle
Submitted: November 21st 2010Reviewed: April 11th 2011Published: November 25th 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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