US5741467-A  Christopher S. Weaver, Natural Gas Vehicles-A Review of the State of the Art, Sep. 1989, Society of Authomotive Engineers 892133, pp. 35-55.;  E.R. Becker et al., Catalyst Design for Emission Control of Carbon Monoxide and Hydrocarbons from Gas Engines, Jun. 1988, Association Dedicated to Air Pollution Control and Hazardous Waste Management Annual Meeting, pp. 1-15.;  J.C. Summers Control of NoxCOHC Emissions from Natural Gas Fueled Stationary Engines with Three-Way Catalysts, Jun. 16-21, 1991, Allied Signal AWMA Annual Meeting, pp. 1-19.;  Jacob Klimstra, Catalytic Converters for Natural Gas Fueled Engines-A Measurement and Control Problem, 1987, Society of Automotive Engineers 892133. pp. 1,2. (Month of publiction is not available).;  Joseph T. Kummer, Review of Factors Related to Natural Gas Engine Emission Controls: Catalysts for NO Decomposition under Oxygen Rich Conditions-Methane Oxidation, Feb. 1991, Gas Research Institute Natural Gas Engine Catalyst Workshop, pp. 7-16.;  Klinghoffer, A.A., et al., "Transient Response of a Monolithic Oxidation Catalyst, in Environmental Catalysis" ACS Symposium Series 552, American Chemical Society, Washington, DC, 1994, pp. 316-323.;  Robert F. Hicks et al., Effect of Catalyst Structure on Methane Oxidation over Palladium on Alumina, 1990, Journal of Catalysis, pp. 295-306. (Month of publication is not available).;  Robert F. Hicks, et al., Structure Sensitivity of Methane Oxidation over Platinum and Palladium, 1990, Journal of Catalysis, pp. 280-294. (Month of publication is not available).;  Se H. Oh. et al., Methane Oxidation over Alumina-Supported Noble Metal Catalysts with and without Cerium Additives, 1991, Journal of Catlysis, pp. 287-301. (Month of publication is not available).;  W. Burton Williamson et al., Poisoning of Platinum-Rhodium Automotive Three-Way Catalysts: Behavior of Single Component Catalysts and Effects of Sulfur and Phosphorous, Mar. 1980, Environmental Science & Technology, pp. 319-324.;  William E. Liss & William H. Thrasher, Natural Gas as a Stationary Engine and Vehicular Fuel, Oct. 1991, Society of Automotive Engineers 912364, pp. 43-62.US6165935-A  Christopher S. Weaver, Natural Gas Vehicles-A Review of the State of the Art, Sep. 1989, Society of Authomotive Engineers 892133, pp. 35-55.;  E. R. Becker et al., Catalyst Design for Emission Control of Carbon Monoxide and Hydrocarbons from Gas Engines, Jun. 1988, Association Dedicated to Air Pollution Control and Hazardous Waste Management Annual Meeting, pp. 1-15.;  J. C. Summers, Control of NoxCOHC Emissions from Natural Gas Fueled Stationary Engines with Three-Way Catalysts, Jun. 16-21, 1991, Allied Signal AWMA Annual Meeting, pp. 1-19.;  Jacob Klimstra, Catalytic Converters for Natural Gas Fueled Engines-A Measurement and Control Problem, 1987, Society of Automotive Engineers 892133, pp. 1,2. (Month of publication is not available).;  Joseph T. Kummer, review of Factors Related to Natural Gas Emission Controls: Catalyst for No Decomposition under Oxygen Rich Conditions-Methane Oxidation, Feb. 1991, Gas Research Institute Natural Gas Engine Catalyst Workshop, pp. 7-16.;  Robert F. Hicks et al., Effect of Catalyst Structure on Methane Oxidation over Palladium on Alumina, 1990, Journal of Catalysis, pp. 295-306. (Month of publication is not available).;  Robert F. Hicks, et al., Structure Sensitivity of Methane Oxidation over Platinum and Palladium, 1990, Journal of Catalysis, pp. 280-294. (Month of publication is not available).;  Se H. Oh. et al., Methane Oxidation over Alumina-Supported Noble Metal Catalysts with and without Cerium Additives, 1991, Journal of Catalysis, pp. 287-301. (Month of publication is not available).;  W. Burton Williamson et al., Poisoning of Platinum-Rhodium Automotive Three-Way Catalysts: Behavior of Single Component Catalysts and Effects of Sulfur and Phosphorous, Mar. 1980, Enviromental Science & Technology, pp. 319-324.;  William E. Liss & William H. Thrasher, Natural Gas as a Stationary Engine and Vehicular Fuel, Oct. 1991, Society of Automotive Engineers 912364, pp. 43-62.