Open access peer-reviewed chapter
By Yu-xing Peng, Zhen-cai Zhu and Guo-an Chen
Submitted: February 10th 2011Reviewed: August 3rd 2011Published: December 22nd 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.
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