Open access peer-reviewed chapter
By Ionara Barcelos and Paula Navarro
Submitted: March 30th 2011Reviewed: November 3rd 2011Published: May 9th 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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