1. Measurement of lung volumes;Ries;Clin Chest Med,1989
2. Lung function testing: selection of reference values and interpretative strategies;American Thoracic Society;Am Rev Respir Dis,1991
3. Pulmonary-function testing;Crapo;N Engl J Med,1994
4. Standardization of spirometry: 1987 update;American Thoracic Society;Am Rev Respir Dis,1987
5. Epidemiology standardization project;Ferris;Am Rev Respir Dis,1978