http://buzzap.jp/news/20170915-tokyo-olympic-bribery/

https://www.cnn.co.jp/fringe/35107176.html

https://dot.asahi.com/dot/2017091500082.html

http://www.asahi.com/articles/ASK9J4GRGK9JULOB00J.html

https://www.nikkei.com/article/DGXLASDG15HBB_W7A910C1CC0000/