Open access peer-reviewed chapter
By Zhiyang Li
Submitted: February 27th 2011Reviewed: September 19th 2011Published: January 11th 2012
DOI: 10.5772/28366
Downloaded: 2053
© 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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