Greenstein et al. 1967
Greenstein, G.S., J.W. Truran, and A.G.W. Cameron, 1967: Helium deficiency in old Halo B stars. Nature, 213, 871-873, doi:10.1038/213871a0.
Calculations show that in old halo B stars most helium will have diffused below the photosphere and therefore will not be detected spectroscopically. This may account for the low abundances of helium observed in these stars.
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Greenstein, G.S., Truran, J.W., and Cameron, A.G.W.: Helium deficiency in old Halo B stars, Nature, 213, 871-873, doi:10.1038/213871a0, 1967.
Greenstein, G.S., J.W. Truran, and A.G.W. Cameron (1967), Helium deficiency in old Halo B stars, Nature, 213, 871-873, doi:10.1038/213871a0.
Greenstein, G.S., J.W. Truran, and A.G.W. Cameron, 1967: Helium deficiency in old Halo B stars. Nature, 213, 871-873, doi:10.1038/213871a0.
Greenstein, G.S., Truran, J.W., & Cameron, A.G.W. 1967, Nature, 213, 871, doi:10.1038/213871a0.
Greenstein GS, Truran JW, Cameron AGW. Helium deficiency in old Halo B stars, Nature 1967;213:871-873. doi:10.1038/213871a0.
G.S. Greenstein, J.W. Truran, A.G.W. Cameron, Nature 213, 871-873, doi:10.1038/213871a0 (1967).
