https://science.srad.jp/story/18/09/19/0530216/

https://www.ayumi-sogo.com/%E3%81%8A%E7%9F%A5%E3%82%89%E3%81%9B/%E5%A4%A7%E9%98%AA%E5%9C%B0%E6%A4%9C%E7%89%B9%E6%8D%9C%E9%83%A8%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B%E5%A0%B1%E9%81%93%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6/

https://www3.nhk.or.jp/kansai-news/20180920/0007553.html

https://dot.asahi.com/dot/2018091200113.html

http://m.seoul.co.kr/news/newsView.php?cp=seoul&id=20180913010017