1. The Japan Petroleum Institute,JPI-5s-49 97, 1–16,1997.
2. 1998 Annual book of ASTM Standards, ASTM D2786, Section 5,05.02, 145–151,1998.
3. 1998 Annual book of ASTM Standards, ASTM D3239, Section 5,05.02, 339–351,1998.
4. 1998 Annual book of ASTM Standards, ASTM D5186, Section 5,05.03, 379–383,1998.
5. Japanese Standards Association, Investigated by Japanese Industrial Standards Committee,JIS K-2536, 1–11,1996.