Open access peer-reviewed chapter
By Luiz Eduardo Moreira Teixeira, Jose Carlos Vilela and Ivana Duval De Araujo
Submitted: January 31st 2011Reviewed: July 7th 2011Published: November 16th 2011
DOI: 10.5772/25742
Downloaded: 2257
© 2011 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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