Open access peer-reviewed chapter
By Pedro Dinis Gaspar, Rui Pedro Mendes and Luís Carrilho Gonçalves
Submitted: June 14th 2011Reviewed: November 16th 2011Published: March 16th 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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