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Submitted on: 31 January 2006.
Revised on: 10 February 2006.
Accepted on: 04 March 2006.
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES
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Submitted on: 02 August 2004.
Revised on: 26 August 2004.
Accepted on: 22 September 2004.
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES