Open access
Submitted: February 23rd, 2012 Published: November 28th, 2012
DOI: 10.5772/52000
From the Edited Volume
Edited by Jucheng Yang, Shan Juan Xie
Submitted: February 23rd, 2012 Published: November 28th, 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.