1. Bellia, V., Cibella, F., Migliara, G., Peralfa, G. and Bonsignore, G. (1985) Characteristics and prognostic value of morning dipping of peak expiratory flow rate in stable asthmatic subjects. Chest, 88, 89–93.
2. Burdon, J.G.W., Juniper, E.F., Killian, K.J., Hargreave, F.E. and Campbell, J.M. (1982) The perception of breathlessness in asthma. Am. Rev. Respir. Dis., 126, 825–8.
3. Cochrane, G.M. and Clark, T.J.H. (1975) A survey of asthma mortality in patients between 36 and 64 in the Greater London hospitals in 1971. Thorax, 30, 300–5.
4. Connolly, C.K. (1987) Falsely high peak expiratory flow readings due to acceleration in the mouth. Br. Med. J., 194, 285.
5. Greenough, A. (1990) Are we recording peak flows properly in young children?. Eur. Respir. J., 31, 1193–6.