Open access peer-reviewed chapter
By Israel Gomy and Wilson Araújo Silva Jr.
Submitted: February 23rd 2011Reviewed: October 3rd 2011Published: February 3rd 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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