Open access peer-reviewed chapter
By Wei Li and Yiliu Tu
Submitted: February 11th 2011Reviewed: July 12th 2011Published: January 11th 2012
DOI: 10.5772/26771
Downloaded: 1523
© 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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