http://www.newsweekjapan.jp/stories/technology/2017/12/11-17.php

http://www.huffingtonpost.jp/2017/12/19/shizuoka-staff-suicide_a_23312452/

https://saiban.in/d/TKY_171221_7333/

http://www.sankei.com/west/news/171222/wst1712220090-n1.html

https://www.nishinippon.co.jp/nnp/national/article/381969/