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Astronomical Society of South Africa. Nature 178, 620 (1956). https://doi.org/10.1038/178620a0
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DOI: https://doi.org/10.1038/178620a0
Nature volume 178, page 620 (1956)
Astronomical Society of South Africa. Nature 178, 620 (1956). https://doi.org/10.1038/178620a0
Issue Date:
DOI: https://doi.org/10.1038/178620a0