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Kensuke Miyamoto
College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 593, Japan
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Mariko Oka
College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 593, Japan
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Junichi Ueda
College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 593, Japan
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Takayuki Hoson
Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan
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Seiichiro Kamisaka
Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan