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3. Epidemiology standardization project: recommended standardized procedures for pulmonary function testing.;Ferris;Am Rev Respir Dis,1978
4. Multi-breath and single-breath helium dilution lung volumes as a test of airway obstruction.;Roberts;Eur Respir J,1990
5. Evaluation of a single-breath method of measuring total lung capacity.;Mitchell;Am Rev Respir Dis,1968