1. see, e.g. M. Ai, Future of imaging technology, Sensors and Actuators A 56 (1996) 31.
2. see, e.g. W. Göpel, K.D. Schierbaum, SnO2 Sensors: Current Status and Future Prospects, Conf. Proc. Eurosensors VIII, Toulouse, France, 1994; W. Göpel, K.D. Schierbaum, Sensors and Actuators B 26 (1995) 1 and references given therein.
3. see, e.g. W. Göpel, K.D. Schierbaum, Molecular recognition for chemical sensing: general survey and specific role of π-conjugated systems, in: Hari Singh Nalwa (Ed.), Handbook of Organic Conductive Molecules and Polymers, Wiley, Chichester, England, 1997, pp. 621–659, and references given therein.
4. W. Göpel, Supramolecular and polymeric structures for gas sensors, Conf. Proc. 5th Int. Meeting on Chemical Sensors, Rome, Italy, 1994; W. Göpel, Sensors and Actuators B 24–25 (1995) 17.
5. A. Hierlemann; M. Schweizer-Berberich; U. Weimar; G. Kraus; A. Pfau, W. Göpel, Pattern recognition and multicomponent analysis, in: H. Baltes, W. Göpel, J. Hesse (Eds.), Sensors Update: Sensor Technology–Applications–Markets, vol. 2, VCH, Weinheim, 1996, p. 119, ISBN 3-527-29432-5.