Open access
Submitted: February 21st, 2011 Published: January 5th, 2012
DOI: 10.5772/27721
From the Edited Volume
Edited by Harry Edmar Schulz, André Luiz Andrade Simões and Raquel Jahara Lobosco
Submitted: February 21st, 2011 Published: January 5th, 2012
© 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.