Open access peer-reviewed chapter
By Lan Zhu, Na Chen and Jinghe Lang
Submitted: March 13th 2011Reviewed: September 16th 2011Published: May 9th 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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