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Open access peer-reviewed chapter
By Miguel Henriques Abreu, Eduarda Matos, Fernando Castro Poças, Rosa Rocha and Jorge Pinto
Submitted: January 24th 2011Reviewed: June 27th 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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