Open access peer-reviewed chapter
By Chao Pan and Li Dong
Submitted: November 24th 2010Reviewed: July 5th 2011Published: November 14th 2011
© 2011 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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