Open access peer-reviewed chapter
By Hitoshi Okamura
Submitted: March 3rd 2011Reviewed: July 27th 2011Published: February 17th 2012
DOI: 10.5772/28873
Downloaded: 1693
© 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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