The Respiratory Dead Space Measured by Single Breath Analysis of Oxygen, Carbon Dioxide, Nitrogen or Helium by J. Bartels and others (1954)

Journal of Clinical Investigation 33(1), 41–48 (1 January 1954), DOI 10.1172/JCI102868. Primary first byline J. Bartels; title identifies a comparison of single-breath gas-analysis measurements. The indexed opening of page 41 describes simultaneous gas-fraction and mouth-flow recording following an oxygen breath.