Open access peer-reviewed chapter
By Peng Nie and Kai-feng Zhang
Submitted: June 29th 2011Reviewed: August 9th 2011Published: December 22nd 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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