https://headlines.yahoo.co.jp/hl?a=20190113-00000014-asahik-soci

https://www.nikkei.com/article/DGXMZO3992636011012019CR8000/

http://www.tokyo-np.co.jp/article/national/list/201901/CK2019011302000142.html

https://www.nikkei.com/article/DGKKZO39688480W9A100C1CR8000/

https://okaguchik.hatenablog.com/entry/2019/01/13/094147