Open access peer-reviewed chapter
By Xue-Gang Guo, Xiang-Ping Wang and Chang-Tai Xu
Submitted: January 29th 2011Reviewed: July 8th 2011Published: November 2nd 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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