Open access peer-reviewed chapter
By Kristi L. Jones, Ling Zhang and Feng Gong
Submitted: November 10th 2010Reviewed: May 23rd 2011Published: November 7th 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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