Open access peer-reviewed chapter
By Lia Fernandes
Submitted: February 10th 2011Reviewed: September 12th 2011Published: March 14th 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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