- https://toyokeizai.net/articles/-/392799?page=5
- https://fx-minkabu-jp.cdn.ampproject.org/v/s/fx.minkabu.jp/news/240025.amp?amp_gsa=1&_js_v=a9&usqp=mq331AQKKAFQArABIIACAw%3D%3D#amp_tf=%251%24s%20%E3%82%88%E3%82%8A&aoh=16672087170977&referrer=https%3A%2F%2Fwww.google.com&share=https%3A%2F%2Ffx.minkabu.jp%2Fnews%2F240025
https://news.yahoo.co.jp/articles/52843b60c331dd4cf72cdfa251dfc02ea61ec287