http://japanese.cri.cn/20180806/ca7ca3c0-a431-bd5d-1f4e-58fb119d6248.html

https://r.nikkei.com/article/DGXMZO33689170R00C18A8L72000

https://headlines.yahoo.co.jp/article?a=20180806-00010008-flash-peo

https://www.toben.or.jp/message/libra/pdf/2018_08/p28-29.pdf

https://www.yamanaka-law.jp/cont3/80.html