Open access peer-reviewed chapter
By Tiejian Feng, Yufeng Hu, Xiaobing Wu and Fuchang Hong
Submitted: November 19th 2010Reviewed: July 15th 2011Published: November 21st 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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