Fabian, P., Borchers, R., Weiler, K. H., Schmidt, U., Volz, A., Ehhalt, D. H., et al. (1979). Simultaneously measured vertical profiles of H2, CH4, CO, N2O, CFCl3 and CF2Cl2 in the midlatitude stratosphere and troposphere. Journal Geophysical Research, 84, 3149-3154.