No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the Cape Grim Air Archive

Mabry JC, Lan T, Boucher C, Burnard PG, Brennwald MS, Langenfelds R & Marty B
Choose the citation style.
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