1. Carroll, Lewis (pseudonym of C.L. Dodgson) (1865) Alice’s Adventures in Wonderland, R. Clay, Son, and Taylor, London, pp. 98.
2. Pride, N.B., Vermiere, P. and Allegra, L. (1989) Diagnostic labels applied to model case histories of chronic airflow obstruction. Responses to a questionnaire in 11 North American and Western European countries. Eur. Resp. J., 2, 702–9.
3. Scadding, J.G. (1959) Principles of definition in medicine. Lancet, 1, 323–5.
4. Scadding, J.G. (1963) Meaning of diagnostic terms in bronchopulmonary disease. Br. Med. J., 2, 1425–30.
5. Scadding, J.G. (1972) The semantics of medical diagnosis. Biomedical Computing, 3, 83–90.