Concentrations and isotope ratios of helium and other noble gases in the Earth's atmosphere during 1978–2011

Brennwald MS, Vogel N, Figura S, Vollmer MK, Langenfelds R, Steele LP, Maden C & Kipfer R
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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