1. Code of Federal Regulations, Title 40, Part 50, U. S. Government Printing Office, Washington DC 1997, p. 5.
2. Regulation of Fuels and Fuel Additives; Standards for reformulated gasoline; Final Rule, Environmental Protection Agency, U. S. Federal Register, Feb 16 1994, 59(32) 7716.
3. Code of Federal Regulations, Title 40, Part 80, U. S. Government Printing Office, Washington DC 1997, p. 474.
4. ASTM Standardization News 1994, June, 26.
5. ASTM Standardization News 1994, June, 23.