Open access peer-reviewed chapter
By Yi-Wen Liu
Submitted: June 7th 2011Reviewed: October 27th 2011Published: April 25th 2012
DOI: 10.5772/37727
Downloaded: 33746
© 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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