- Received January 13, 2016.
- Accepted March 7, 2016.
- Published online March 30, 2016.
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- Hisashi Nakao1⇑,
- Kohei Tamura2,
- Yui Arimatsu3,
- Tomomi Nakagawa4,
- Naoko Matsumoto4 and
- Takehiko Matsugi5
- 1Department of Global and Science Studies, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8511, Japan
- 2Department of Engineering Mathematics, University of Bristol, Bristol, UK
- 3Frontier Research Institute for Interdisciplinary Science, Tohoku University, Sendai, Miyagi, Japan
- 4Graduate School of Humanities and Social Sciences, Okayama University, Okayama, Japan
- 5National Museum of Japanese History, Sakura, Japan