Open access peer-reviewed chapter
By Caroline Joy Steel, Maria Gabriela Vernaza Leoro, Marcio Schmiele, Reinaldo Eduardo Ferreira and Yoon Kil Chang
Submitted: May 26th 2011Reviewed: October 13th 2011Published: March 28th 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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