Open access peer-reviewed chapter
By Jianlin Liu
Submitted: May 23rd 2011Reviewed: October 12th 2011Published: March 28th 2012
© 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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