Open access peer-reviewed chapter
By Xie You-Bai
Submitted: November 16th 2010Reviewed: May 10th 2011Published: October 12th 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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