1. Proceedings of the International Symposium on Solid Oxide Fuel Cells, Nagoya, Japan, 13–14 November, 1989, edited by O. Yamamoto, M. Dokiya and H. Tagawa (Science House Coy. Ltd., Tokyo, 1989) pp. 1–37, 119–125.
2. Proceedings of the 2nd International Symposium on Solid Oxide Fuel Cells, Athens, Greece, 2–5 July, 1991, edited by F. Grosz, P. Zegers, S. C. Singhal and O. Yamamoto (Commission of European Communities) pp. 1–135, 167–205.
3. S. Barnett, Energy 15 (1990) 1.
4. H. Yahiro, Y. Baba, K. Eguchi and H. Arai, J. Electrochem. Soc. 135 (1988) 2077.
5. T. Kenjo, S. Osawa and H. Murahashi, Denki Kagaku 58 (1990) 533.