Open access peer-reviewed chapter
By Alex Sandro Rolland Souza
Submitted: April 5th 2011Reviewed: December 6th 2011Published: July 19th 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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