1. and , “Limits of Inflammability of Gases and Vapors,” U.S. Bureau of Mines, Bulletin 279, 1939.
2. “Limits of Flammability,” Proc. 4th Symp. on Combustion, The Combustion Institute, pp 4–13, 1952.
3. and , “The Limits of Inflammability of Mixtures of Methane and Air,” U.S. Bureau of Mines, Technical Paper 119, 1915.
4. and , “Detection of Inflammable Gas and Vapor,” p 2, 1896.