Open access peer-reviewed chapter
By Adriano Carvalho and Maria Teresa Outeiro
Submitted: November 11th 2010Reviewed: July 6th 2011Published: October 10th 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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