Open access peer-reviewed chapter
By Arnaldo Maldonado Jr., Raquel Simões and Silvana Thiengo
Submitted: June 25th 2011Reviewed: December 12th 2011Published: April 4th 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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