Open access peer-reviewed chapter
By Vânia André and M. Teresa Duarte
Submitted: March 3rd 2011Reviewed: September 29th 2011Published: December 16th 2011
DOI: 10.5772/28954
Downloaded: 7078
© 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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