1. 1) Research on Human Elements in Maritime Equipment, Japan Ship Machinery and Equipment Association, 2007 (in Japanese).
2. 舶用機器におけるヒューマン・エレメントに関する研究動向調査，日本舶用工業会，2007．
3. 2) Current Status of Autonomous ships, Ministry of Land, Infrastructure, Transport and Tourism, web page, 2017. http://www.mlit.go.jp/common/001215815.pdf (in Japanese).
4. 自動運航船の現状等．国土交通省ホームページ，2017．
5. 3) Minami, K.: Navigation of Unmanned Vessels and Act on Preventing Collision at Sea, Journal of Maritime Transport Studies, Vol.66, pp.91-102, 2017 (in Japanese).