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The Smithsonian Astrophysical Observatory. Nature 207, 470 (1965). https://doi.org/10.1038/207470a0
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DOI: https://doi.org/10.1038/207470a0
Nature volume 207, page 470 (1965)
The Smithsonian Astrophysical Observatory. Nature 207, 470 (1965). https://doi.org/10.1038/207470a0
Published:
Issue Date:
DOI: https://doi.org/10.1038/207470a0