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No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the Cape Grim Air Archive
Mabry, J. C., Lan, T., Boucher, C., Burnard, P. G., Brennwald, M. S., Langenfelds, R., & Marty, B. (2015). No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the Cape Grim Air Archive. Earth and Planetary Sciences Letters, 428, 134-138. https://doi.org/10.1016/j.epsl.2015.07.035
Concentrations and isotope ratios of helium and other noble gases in the Earth's atmosphere during 1978–2011
Brennwald, M. S., Vogel, N., Figura, S., Vollmer, M. K., Langenfelds, R., Steele, L. P., … Kipfer, R. (2013). Concentrations and isotope ratios of helium and other noble gases in the Earth's atmosphere during 1978–2011. Earth and Planetary Sciences Letters, 366, 27-37. https://doi.org/10.1016/j.epsl.2013.01.039