1. Ackerman, M. & Muller, C. 1972. Stratospheric methane from infrared spectra. In Proc. Sym. Sources, Sinks and Concentrations of Carbon Monoxide and Methane in the Earth's Environment, St. Petersburg Beach, Fla. August 15-17, pp. 12. 1-12. 11.
2. Isotopic composition of atmospheric hydrogen and methane;Bainbridge;Nature,1961
3. Measurements of methane in the troposphere and lower stratosphere;Bainbridge;Tellus,1966
4. Tritium and deuterium in atmospheric methane;Begemann;J. Geophys. Res.,1968
5. Benoit, R. 1973. Private communication.