Open access
Submitted: 16 November 2011 Published: 26 October 2012
DOI: 10.5772/48254
From the Edited Volume
Edited by Luis Fernando Marmolejo Rebellon
Submitted: 16 November 2011 Published: 26 October 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.