Open access peer-reviewed chapter
By Maria Verônica de Souza and José de Oliveira Pinto
Submitted: October 28th 2010Reviewed: March 18th 2011Published: November 4th 2011
© 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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