1. California Air Resources Board Mail Out #91-01, January 3, 1991.
2. GM Micro-Computer Engine Control System;Grimm,1980
3. Detection of Catalyst Performance Loss Using On-Board Diagnostics;Clemmens,1990
4. Catalytic Converter Monitor;Hile,1973
5. Detecting Malfunction in Cylinders of Internal Combustion Engines;Hanson,1976