Open access peer-reviewed chapter
By Qiaoling Li and Yahong Cao
Submitted: May 17th 2011Reviewed: October 6th 2011Published: March 9th 2012
DOI: 10.5772/35880
Downloaded: 7150
© 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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