http://president.jp/articles/-/22693
http://blog.livedoor.jp/kamisamanokarte/archives/cat_82850.html
https://www.asahi.com/sp/articles/ASK4L53J3K4LUTQP019.html?ref=amp_rellink
http://www.yomiuri.co.jp/olympic/2018/skate/20180219-OYT1T50052.html
https://mainichi.jp/sportsspecial/articles/20180219/k00/00m/050/117000c