Open access peer-reviewed chapter
By Nuno Santos, Margarida Correia-Neves, Virgílio Almeida and Christian Gortázar
Submitted: April 23rd 2011Reviewed: December 21st 2011Published: April 20th 2012
DOI: 10.5772/33781
Downloaded: 1579
© 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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