Open access peer-reviewed chapter
Submitted: July 19th, 2011 Reviewed: January 25th, 2012 Published: April 20th, 2012
DOI: 10.5772/38897
From the Edited Volume
Edited by Yuzhou Luo
Submitted: July 19th, 2011 Reviewed: January 25th, 2012 Published: April 20th, 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.