1. Diurnal variation of asthma;Clark;Br. J. Dis. Chest,1977
2. Diurnal rhythms in airway obstruction;Connolly;Br. J. Dis. Chest,1979
3. Circadian variation in an immune response in man;Cove-Smith;Br. med. J.,1978
4. Normal circadian rhythms in peak expiratory flow rate;Hetzel;Thorax,1978
5. Report of the MRC committee on the aetiology of chronic bronchitis;Medical Research Council;Lancet,1965