Open access peer-reviewed chapter
By Shen Xiaohong, Wang Haiyan, Zhang Yuzhi and Zhao Ruiqin
Submitted: April 27th 2011Reviewed: September 16th 2011Published: March 28th 2012
DOI: 10.5772/33985
Downloaded: 2030
© 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.
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