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2. Morbiditv statistics from general practice. Third national study 1981-82;Office of Population Censuses and Surveys, Royal College of Gencral Practitioners, Department of Health and Social Securitv,1986
3. Asthma mortality in England and Wales: evidence for a further increase;Burney, P.G.J.;Lancet,1974
4. Trends in morbidity and mortality from asthma;Alderson, A.M.;Population Trends,1987
5. Population Censtuses and Surveys. !lospital i'n-patient enquire;Department of Health and Social Security, Office of,4,