Open access peer-reviewed chapter
By Ping Guo, Zhouhua Wang, Yanmei Xu and Jianfen Du
Submitted: November 23rd 2010Reviewed: May 17th 2011Published: November 4th 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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