Open access peer-reviewed chapter
By José Sebastião Santos, Carlos A.M. Donadelli, Rafael Kemp, Alberto Facury Gaspar and Wilson Salgado Jr.
Submitted: October 21st 2010Reviewed: April 17th 2011Published: November 14th 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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