Open access peer-reviewed chapter
By Wei Wang
Submitted: May 12th 2011Reviewed: February 29th 2012Published: March 30th 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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