1. Yamamoto Tatsuo and Muvakami Kenji, “Humidity sensor using TiO2−SnO2 ceramics,” Chem. Sensor Technol.2, 133–149 (1989).
2. L. Ketron, “Ceramic sensors,” Bull. Amer. Ceram. Soc.,68, No. 4, 860–865 (1989).
3. T. Nitta and F. Fukusima, “New ceramic humidity sensor,” in: New Materials and New Processes, Cleveland, Ohio (1985), pp. 384–389.
4. Shimizu Yasahiro, Avai Hiromi, and Seivama Tetsuro, “Ceramic humidity sensors,” Denki Kagaku,50, No. 10, 831–834 (1982).
5. Hamano Kenya, Nakagawa Zenbe, and Enmei Shoichiro, “Preparation of porous spinel ceramics and their electrical properties,” Rep. Res. Lab. Eng. Mater., No. 10, 65–77 (1985).