1. Concepts of normality applied to the measurement of lung function;Becklake;Am J Med,1986
2. Pulmonary Function Testing—Guidelines and Controversies,1982
3. Lung function: Assessment and Application in Medicine;Cotes,1979
4. Reference Spirometric values using techniques and equipment that meet ATS recommendations;Crapo;Am Rev Respir Dis,1981
5. Win neues Galvanometer;Einthoven;Ann Physik,1903