1. P. Romppainen. Electrical Studies on the Response Characteristics of Tin Dioxide-based Semiconductor Gas Sensors. Acta Univ. Oui. C 47, Oulu, Finland, 1988.
2. G. Heiland. Homogeneous Semiconducting Gas Sensors. Sensors and Actuators 2 (1982) 343–361.
3. A. A. Saaman and P. Bergveld. A Classification of Chemically Sensitive Semiconductor Devices. Sensors and Actuators 7 (1985) 75–87.
4. P. T. Moseley. Materials Selection for Semiconductor Gas Sensors. Eurosensors conference, Rome, Italy, 30 Sept. — 2. Oct., 1991.
5. D. E. Williams. Conduction and Gas Response of Semiconductor Gas Sensors, in Solid State Gas Sensors. Eds. P. T. Moseley and B. C. Tofield, Adam Hilger, Bristol, 1987, pp. 71–123.