https://www.asahi.com/articles/ASL50443XL50UTIL01K.html
http://www.courts.go.jp/app/files/hanrei_jp/784/087784_hanrei.pdf
https://headlines.yahoo.co.jp/hl?a=20180601-00007972-bengocom-soci
http://www.courts.go.jp/app/files/hanrei_jp/785/087785_hanrei.pdf