http://www.nikkei-science.com/201807_028.html http://www.nikkei-science.com/201807_030.html

https://this.kiji.is/373763836593423457?c=113147194022725109

https://news.nifty.com/article/item/neta/12111-44684/

http://blog.livedoor.jp/schulze/archives/52215670.html

https://twitter.com/gogo_yukky/status/1006447411789623296