Open access peer-reviewed chapter
By Ping Li and Guizhen Liu
Submitted: May 16th 2011Reviewed: September 27th 2011Published: March 2nd 2012
DOI: 10.5772/35778
Downloaded: 1909
© 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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