Open access peer-reviewed chapter
By Paulo J. Amorim Madeira and M. Helena Florêncio
Submitted: April 2nd 2011Reviewed: August 26th 2011Published: February 29th 2012
DOI: 10.5772/31736
Downloaded: 5806
© 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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