References
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- Lilly J.C., Anderson T. F., Howey J. P. The nitrogen meter, National Research Council. CMR-CAM Rep 1943; No. 299
- Baldes E. J., Boothby W. M., Helmholz H. F., Jr., Lundin G. Use of Lilly nitrogen meter in measurements of nitrogen elimination. Symposium on Military Physiology, Digest Series, No. 4. G. E. 61/14–6. Military Research and Development Board, Washington, DC Dec., 1947
- Boothby W. M., Lundin G., Helmholz H. F., Jr. Gaseous nitrogen elimination test to determined pulmonary efficiency. Proc. Soc. Exper. Biol. & Med 1948; 67: 558
- Roelsen E. Composition of alveolar air investigated by fractional sampling. Acta med. Scandinav 1939; 98: 194