1. Graham P, Rutter ML, Yule W, Pless IB: Childhood asthma: A psychosomatic disorder? Some epidemiological considerations. Br J Prev Soc Med 21:78–85, 1967
2. Leigh D, Marley E: Bronchial Asthma: A Genetic Population and Psychiatric Study. Oxford, Pergamon Press, 1967
3. Taylor B: Severe asthma in childhood. NZ Med J 85:433–435, 1977
4. Norrish M, Tooley M, Godfrey S: Clinical, physiological, and psychological study of asthmatic children attending a hospital clinic. Arch Dis Child 52:912–917, 1975
5. Peckham C, Butler N: A national study of asthma in childhood. J Epidemiol Community Health 32:79–85, 1978