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Hisatada Akahane
Toyama Science Museum Present address: Koshimachi 1-86, Toyama 931-8417, Japan
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Masaaki Shimizu
Graduate School of Science and Engineering, University of Toyama
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Hiroyuki Imai
Sakuranobabacho 253-1, Nishinoyama, Yamashinaku, Kyoto 607-8308, Japan
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Kenro Tsunoda
Faculty of Education and Human Sciences, University of Yamanashi Present address: Oote 2-2-33, Kofu 400-0015, Japan