https://headlines.yahoo.co.jp/videonews/fnn?a=20181121-00405949-fnn-soci

https://www3.nhk.or.jp/news/html/20181121/k10011719041000.html

https://this.kiji.is/437921483540890721?c=39546741839462401

http://www.mext.go.jp/b_menu/shingi/chukyo/chukyo4/041/siryo/__icsFiles/afieldfile/2018/11/13/1411055_002.pdf?fbclid=IwAR1pdB9IqYkuIm6H5gbQgu7e5rb3qLk2C50BLTpCPYLlT32ff7ToChIUTfs

https://univ-journal.jp/23649/ http://kounomaki.blog84.fc2.com/