References
- Holmgren A. Determination of the functional residual volume by means of the helium dilution method. Scandinav. J. Clin. & Lab. Investigation 1954; 6: 131
- Birath G., Swenson E. W. A correction factor for helium absorption in lung volume determinations. Scandinav. J. Clin. & Lab. Investigation 1956; 8: 155