WO200259565-A2  MIURA ET AL.: 'Mixed potential type NOx sensor based on stabilized zirconia and oxide electrode' J. ELECTROCHEM. SOC. vol. 143, no. 2, 02 February 1996, pages L33 - L35, XP000196991US6605202-B1  Hibion, et al., "High-Temperature Hydrocarbon Sensors Based on a Stabilized Zirconia Electrolyte and Metal Oxide Electrodes," Electrochemical and Solid-State Letters, 2 912) 651-653 (1999) Month unavailable.;  Li et al., "High-temperature Carbon Monoxide Potentiometric Sensor," J. Electrochem. Soc., vol. 140, No. 4, pp. 1068-1073, Apr. 1993.;  Miura et al., "Highly Slective CO Sensor Using Stabilized Zirconia and a Couple of Oxide Electrodes," Sensors and Actuators B 47, (1988) Month unavailable 84-91.;  Miura et al., "Mixed Potential Type NO2 Senosr Based on Stabilized Zirconia and Oxide Electrode," Electrochem. Soc., vol. 143, No. 2, pp. 33-35, Feb. 1996.;  Miura et al., "Mixed-Potential-Type Propylene Sensor Based on Stabilized Zirconia and Oxide Electrode," Electrochemistry Communications, 2 (2000) Month unavailable 77-80.;  Mukundan et al., "Ceria-Electrolyte-Based Mixed Potential Sensors for the Detection of Hydrocarbons and Carbon Monoxide," Electrochemical and Solid-State Letters, 2 (8) 412-414 (1999) Month unavailable.;  Williams et al., "Solid Electrolyte Mixed Potential Phenomena," Solid State Chemistry 1982, Proceedings of the Second European Conference, Veldhoven, The Netherlands, Jun. 7-9, 1982, R. Metselaar, H.J.M. Heijlgers and J. Schoonman (Eds), Studies in Inorganic Chemistry, vol. 3.US7214333-B2  Hibion, et al., "High-Temperature Hydrocarbon Sensors Based on a Stabilized Zirconia Electrolyte and Metal Oxide Electrodes," Electrochemical and Solid-State Letters, 2 912) 651-653 (1999).;  Li et al., "High-temperature Carbon Monoxide Potentiometric Sensor," J. Electrochem. Soc., vol. 140, No. 4, pp. 1068-1073, Apr. 1993.;  Miura et al., "Highly Slective CO Senosr Using Stabilized Zirconia and a Couple of Oxide Electrodes," Sensors and Actuators B 47, (1988) 84-91.;  Miura et al., "Mixed Potential Type NO2 Sensor Based on Stabilized Zirconia and Oxide Electrode," Electrochem. Soc., vol. 143, No. 2, pp. 33-35, Feb. 1996.;  Miura et al.,"Mixed-Potential-Type Propylene Sensor Based on Stabilized Zirconia and Oxide Electrode," Electrochemistry Communications, 2 (2000) 77-80.;  Mukundan et al., "Ceria-Electrolyte-Based Mixed Potential Sensors for the Detection of Hydrocarbons and Carbon Monoxide," Electrochemical and Solid-State Letters, 2 (8) 412-414 (1999).;  Williams et al., "Solid Electrolyte Mixed Potential Phenomena," Solid State Chemistry 1982, Proceedings of the Second European Conference, Veldhoven, The Netherlands, Jun. 7-9, 1982, R. Metselaar, H.J.M. Heijlgers and J. Schoonman (Eds), Studies in Inorganic Chemistry, vol. 3.WO200259565-A3  MIURA ET AL.: 'Mixed potential type NOx sensor based on stabilized zirconia and oxide electrode' J. ELECTROCHEM. SOC. vol. 143, no. 2, 02 February 1996, pages L33 - L35, XP000196991