1. Persaud, K. & Dodd, G. Analysis of discrimination mechanisms in the mammalian olfactory system using a model nose. Nature 299, 352–355 (1982).
2. Pavlou, A., Turner, A. P. F. & Barr, H. Diagnosis of gastric and lung disorders. UK Patent 01155844.3 (1999).
3. Gibson, T. D., Puttick, P., Hulbert, J. N., Marshall, R. W. & Li, Z. Odor sensor. US Patent 5,928,609 (1999).
4. Lewis, N. & Freund, M. Sensor arrays for detecting microorganisms. US Patent 6,017,440 (2000).
5. Rong, L., Ping, W. & Yi, T. Flexible electronic nose for diabetes non-destructive breathing smell diagnosis. Canadian Patent CA2430111U (2001).