1. P. Kofstad,Nonstoichiometry, Diffusion and Electrical Conductivity in Binary Metal Oxides, Krieger, Malabar, FL (1983).
2. P. T. Moseley and B. C. Tofield,Solid-State Gas Sensors, Adam Hilger, Bristol (1987).
3. M. J. Madou and S. R. Morrison,Chemical Sensing with Solid State Devices, Academic Press, Boston (1989).
4. J. Sberveglieri,Gas Sensors, Kluwer, Dordrecht (1992).