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*Masaharu Nakagawa
Department of Natural Sciences, Faculty of Science, Kochi University
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M. Santosh
Department of Natural Sciences, Faculty of Science, Kochi University
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K. V. W. Kehelpannala
Institute of Fundamental Studies, Kandy, Sri Lanka
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Kimie Matsuura
Department of Natural Sciences, Faculty of Science, Kochi University
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Yasuhiro Kuwada
Department of Natural Sciences, Faculty of Science, Kochi University
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K. J. Mathew
Department of Geology, S. N. College, Kollam, Kerala, India