Literatur
G. E. Hale, Astrophys. Journ.70, 265, 1929;71, 73, 1930.
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Grotrian, W. G. E. Hales Spektrohelioskop. Naturwissenschaften 19, 193–202 (1931). https://doi.org/10.1007/BF01522272
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DOI: https://doi.org/10.1007/BF01522272