1. Clean Air Act Amendment 1970 (Public Law 91-604) CFR 35/219/II; USA-Federal Register, Bd. 37, Nr. 221, Teil II, 15. Nov. 1972, S. 24250;
2. Code of Fed. Reg., Bd. 40 (1977),
3. Teil 86; Japan/Safety Regulations for Road Vehicles - including pollution control, Ministery of Transport, Febr. 1974.
4. Prog. Energy Combust. Sci. 6/177 Pergamon Press Ltd.;
5. : ?Automotive Pollution Control Catalysts and Devices?. Noyes Data Corp. 1977;