1. A group investigation by practitioners of the South-East Scotland Faculty of the College of General Practitioners;Emergency calls in general practice;Health Bull (Edinb),1957
2. Cigarette smoking and respiratory infections in a class of student nurses;Parnell;N Engl J Med,1966
3. Respiratory infections among children in day nurseries;Hesselvik;Acta Paediatr Scand,1949
4. Respiratory illness in preschool children with different forms of day care;Strangert;Pediatrics,1976
5. Acute respiratory illnesses among children and adults;Hilleman,1962