Open access peer-reviewed chapter
By Mototsugu Nishii and Tohru Izumi
Submitted: February 23rd 2011Reviewed: July 13th 2011Published: February 15th 2012
© 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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