Open access peer-reviewed chapter
By Wei Shougang and Xie Xincai
Submitted: March 11th 2011Reviewed: September 1st 2011Published: February 17th 2012
DOI: 10.5772/29783
Downloaded: 24175
© 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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