1. Automotive spark ignition engine emission control systems to meet the requirements of the 1970 Clean Air Ammendments, Report of the Panel on Emission Control Systems, National Academy of Sciences, Committee on Motor Vehicle Emissions, Washington, D.C., 1973.
2. Emission control of engine systems, Consultant Report to the Committee of Motor Vehicle Emissions, National Academy of Sciences, Environmental Protection Agency, Washington, D.C., September 1974.
3. Extensive material on automotive emission control can be found in the S.A.E. Trans. and other S.A.E. publications.
4. Emissions from Combustion Engines and Their Control;PATTERSON,1972