%0 Journal Article %A Margaret R. Becklake %T A New Index of the Intrapulmonary Mixture of Inspired Air %D 1952 %R 10.1136/thx.7.1.111 %J Thorax %P 111-116 %V 7 %N 1 %U https://thorax.bmj.com/content/thoraxjnl/7/1/111.full.pdf