Open access peer-reviewed chapter
By Graça Loureiro, Beatriz Tavares, Daniel Machado and Celso Pereira
Submitted: September 27th 2011Reviewed: October 30th 2011Published: March 21st 2012
DOI: 10.5772/39069
Downloaded: 2818
© 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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