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Schermer, T., J. Jacobs, N. Chavannes, J. Hartman, H. Folgering, B. Bottema, και C. van Weel. Validity of Spirometric Testing in a General Practice Population of Patients With Chronic Obstructive Pulmonary Disease (COPD). BMJ Group, 2003.

Schermer, T., et al. Validity of Spirometric Testing in a General Practice Population of Patients With Chronic Obstructive Pulmonary Disease (COPD). BMJ Group, 2003.