Open access peer-reviewed chapter
By Luciana de Souza Cardoso, Carlos Ruberto Fragoso Jr., Rafael Siqueira Souza and David da Motta Marques
Submitted: March 22nd 2011Reviewed: July 23rd 2011Published: January 5th 2012
DOI: 10.5772/30669
Downloaded: 2243
© 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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