1. Tobacco smoking, respiratory symptoms, and ventilatory capacity: studies in random sample of the population;Higgins;Br Med J,1958
2. Epidemiology of Chronic Non-specific Lung Disease;van der Lende,1969
3. Respiratory diseases task force report on problems, research approaches, needs;National Heart and Lung Institute;DHEW Publication No. (NIH) 73–432,1972
4. Chronic respiratory disease among non-smokers in Hagerstown, Maryland;Stebbings;Envir Res,1971
5. Chronic non-specific respiratory diseases in Cracow;Sawicki;Epid Rev,1972