Open access peer-reviewed chapter
By Jianfeng Li, Wenmao Liu and Bin Zhang
Submitted: June 28th 2011Reviewed: January 25th 2012Published: April 20th 2012
DOI: 10.5772/38703
Downloaded: 2418
© 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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