Open access
Submitted: February 23rd, 2011 Published: January 18th, 2012
DOI: 10.5772/27913
From the Edited Volume
Edited by Roberto C. Hincapie and Javier E. Sierra
Submitted: February 23rd, 2011 Published: January 18th, 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.