Open access peer-reviewed chapter
By Mônica Lúcia Rodrigues, Hugo Fontan Köhler and Luiz Paulo Kowalski
Submitted: April 19th 2011Reviewed: November 25th 2011Published: March 14th 2012
DOI: 10.5772/33381
Downloaded: 3296
© 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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