Open access peer-reviewed chapter
By Alaneir de Fátima dos Santos, Humberto José Alves, Cláudio de Souza, Simone Ferreira dos Santos, Rosália Morais Torres and Maria do Carmo Barros de Melo
Submitted: June 9th 2011Reviewed: November 18th 2011Published: April 27th 2012
DOI: 10.5772/37970
Downloaded: 1558
© 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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