https://yomitai.jp/series/rikonsan/01-kyougirikon/

http://nlab.itmedia.co.jp/nl/articles/1810/19/news132.html

https://www.asahi.com/articles/ASLBJ7FJ8LBJPIHB02V.html https://headlines.yahoo.co.jp/hl?a=20181022-00000000-kobenext-l28

https://www.nikkei.com/article/DGXMZO36623730Y8A011C1TCJ000/

https://ameblo.jp/ichikawa42/entry-12413046810.html