1. Chemistry and Physiology of Los Angeles Smog
2. Anon., The Clean Air Act as Amended August 1977, U. S. Governmental Printing Office, 1977, Serial No. 95–11
3. G. G. Robson, Platinum 1986, Johnson Matthey Plc, May 1986, pp 26, 42 and 44
4. W. Berg, Evolution of Motor Vehicle Emission Control Legislation Leading to the Catalyst Car?, SAE 850384
5. M. P. Walsh, Global Trends in Motor Vehicle Air Pollution Control, SAE 850383