Open access peer-reviewed chapter
By Shigeru Nozu, Hiroaki Tsuji and Kenji Onishi
Submitted: February 3rd 2011Reviewed: July 18th 2011Published: December 22nd 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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