1. Development of Basic Technologies Primarily on the Utilization of Hydrogen–Development of Common Basic Technologies on Hydrogen–Basic Research on Aluminum for Hydrogen, 2003–2004 fiscal year report, http://www.tech.nedo.go.jp.
2. Japan patent opening file No. 1999-104762.
3. Metallurgical factors affecting high strength aluminum alloy production
4. The survey committee on the vessel made of aluminum alloy for diving, the survey report on diving vessel made of aluminum alloy, October, 2001, http://www.tech.nedo.go.jp.