Open access peer-reviewed chapter
By Leonora M. Mattos, Celso L. Moretti and Marcos D. Ferreira
Submitted: May 16th 2011Reviewed: November 17th 2011Published: May 30th 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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