Open access peer-reviewed chapter
By Carlos Gilberto Raetano, Denise Tourino Rezende and Evandro Pereira Prado
Submitted: October 22nd 2010Reviewed: April 3rd 2011Published: November 2nd 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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