あとでちゃんと読み直します…。
- https://mathwords.net/saikyukouka
- https://qiita.com/junichiro/items/527b1f211ed814528ded
- https://qiita.com/kenmatsu4/items/d282054ddedbd68fecb0
- https://qiita.com/ruka38/items/bd212cb1741d35d8dde3
- http://www.birdland.co.jp/wordpress/?p=664
- http://nonbiri-tereka.hatenablog.com/entry/2014/06/24/124455
- http://minus9d.hatenablog.com/entry/2015/01/27/231820