Open access peer-reviewed chapter
By Huiqiong Chen and Qigang Gao
Submitted: June 16th 2010Reviewed: September 20th 2010Published: February 3rd 2011
© 2011 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike-3.0 License, which permits use, distribution and reproduction for non-commercial purposes, provided the original is properly cited and derivative works building on this content are distributed under the same license.
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