Open access
Published: 21 October 2011
DOI: 10.5772/21512
From the Edited Volume
Edited by Luis M. Amezcua-Guerra
Published: 21 October 2011
© 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.