Open access peer-reviewed chapter
By Ling-li Zhang, Yi Liang, Li-nan Zeng and Die Hu
Submitted: March 4th 2011Reviewed: October 9th 2011Published: June 29th 2012
DOI: 10.5772/29071
Downloaded: 2754
© 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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