References
- “Air in Beer—I. Determination of Air in Bottled Beer.” Martin Roberts, Stephen Laufer, Earl D. Stewart, American Brewer 80, No. 7, 1947; Proceedings, 1947 Congress of Continental Brewery Center, June 1947. (Contains also references to literature on “Air in Beer.”)
- “Air in Beer—II. Determination of Air in Wort and Storage Beer.” Martin Roberts, Stephen Laufer, Earl D. Stewart. These Proceedings, p. 87.