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the optical excitation function of helium
Phys. Rev. 36, 604 – Published 1 August, 1930
DOI: https://doi.org/10.1103/PhysRev.36.604
Phys. Rev. 36, 604 – Published 1 August, 1930
DOI: https://doi.org/10.1103/PhysRev.36.604