FR2916653-A1  UCHIDA H ET AL: "Relation between proton and hole conduction in SrCeO3-based solid electrolytes under water-containing atmospheres at high temperatures" Solid State Ionics Netherlands, vol. 11, no. 2, 1983, pages 117-124, XP002465960 ISSN: 0167-2738;  IWAHARA H ET AL: "High temperature type proton conductor based on SrCeO3 and its application to solid electrolyte fuel cells" PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON SOLID STATE IONICS 4-8 JULY 1983 GRENOBLE, FRANCE, vol. 9-10, 1983, pages 1021-1025, XP002465959 Solid State Ionics Netherlands ISSN: 0167-2738;  IWAHARA H ET AL: "Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production" PROCEEDINGS OF THE THIRD INTERNATIONAL MEETING ON SOLID ELECTROLYTES - SOLID STATE IONICS AND GALVANIC CELLS 15-19 SEPT. 1980 TOKYO, JAPAN, vol. 3-4, 1981, pages 359-363, XP002465958 Solid State Ionics Netherlands ISSN: 0167-2738;  KOBAYASHI T ET AL: "Reduction of nitrogen oxide by a steam electrolysis cell using a proton conducting electrolyte" SOLID STATE IONICS, NORTH HOLLAND PUB. COMPANY. AMSTERDAM, NL, vol. 86-88, juillet 1996 (1996-07), pages 603-607, XP004070101 ISSN: 0167-2738WO2008152317-A2  UCHIDA H ET AL: "Relation between proton and hole conduction in SrCeO3-based solid electrolytes under water-containing atmospheres at high temperatures" Solid State Ionics Netherlands, vol. 11, no. 2, 1983, pages 117-124, XP002465960 ISSN: 0167-2738;  IWAHARA H ET AL: "High temperature type proton conductor based on SrCeO3 and its application to solid electrolyte fuel cells" PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON SOLID STATE IONICS 4-8 JULY 1983 GRENOBLE, FRANCE, vol. 9-10, 1983, pages 1021-1025, XP002465959 Solid State Ionics Netherlands ISSN: 0167-2738;  IWAHARA H ET AL: "Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production" PROCEEDINGS OF THE THIRD INTERNATIONAL MEETING ON SOLID ELECTROLYTES - SOLID STATE IONICS AND GALVANIC CELLS 15-19 SEPT. 1980 TOKYO, JAPAN, vol. 3-4, 1981, pages 359-363, XP002465958 Solid State Ionics Netherlands ISSN: 0167-2738;  KOBAYASHI T ET AL: "Reduction of nitrogen oxide by a steam electrolysis cell using a proton conducting electrolyte" SOLID STATE IONICS, NORTH HOLLAND PUB. COMPANY. AMSTERDAM, NL, vol. 86-88, juillet 1996 (1996-07), pages 603-607, XP004070101 ISSN: 0167-2738EP2168198-A2  See also references of WO 2008152317A2US2010196767-A1  Kobayashi, Reduction of nitrogen oxide by a steam electrolysis cell using a proton conducting electrolyte, 10-1995, Solid State Ionics, 86-88, 603-607EP2168198-B1  KOBAYASHI T ET AL: "Reduction of nitrogen oxide by a steam electrolysis cell using a proton conducting electrolyte" SOLID STATE IONICS, NORTH HOLLAND PUB. COMPANY. AMSTERDAM, NL, vol. 86-88, juillet 1996 (1996-07), pages 603-607, XP004070101 ISSN: 0167-2738;  IWAHARA H ET AL: "Proton conduction in sintered oxides and its application to steam electrolysis for hydrogen production" PROCEEDINGS OF THE THIRD INTERNATIONAL MEETING ON SOLID ELECTROLYTES - SOLID STATE IONICS AND GALVANIC CELLS 15-19 SEPT. 1980 TOKYO, JAPAN, vol. 3-4, 1981, pages 359-363, XP002465958 Solid State Ionics Netherlands ISSN: 0167-2738;  IWAHARA H ET AL: "High temperature type proton conductor based on SrCeO3 and its application to solid electrolyte fuel cells" PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON SOLID STATE IONICS 4-8 JULY 1983 GRENOBLE, FRANCE, vol. 9-10, 1983, pages 1021-1025, XP002465959 Solid State Ionics Netherlands ISSN: 0167-2738;  UCHIDA H ET AL: "Relation between proton and hole conduction in SrCeO3-based solid electrolytes under water-containing atmospheres at high temperatures" Solid State Ionics Netherlands, vol. 11, no. 2, 1983, pages 117-124, XP002465960 ISSN: 0167-2738