Open access peer-reviewed chapter
By Qigui Li and Mark Hickman
Submitted: April 19th 2011Reviewed: July 20th 2011Published: April 20th 2012
DOI: 10.5772/33352
Downloaded: 2483
© 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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