Open access peer-reviewed chapter
By José Creissac Campos, João Saraiva, Carlos Silva and João Carlos Silva
Submitted: April 14th 2011Reviewed: September 27th 2011Published: March 7th 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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