Open access peer-reviewed chapter
By Junji Ohtsubo
Submitted: October 29th 2010Reviewed: March 14th 2011Published: November 9th 2011
DOI: 10.5772/18804
Downloaded: 2194
© 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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