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Illinois Journal of Mathematics . Nature 180, 70 (1957). https://doi.org/10.1038/180070b0
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DOI: https://doi.org/10.1038/180070b0
Nature volume 180, page 70 (1957)
Illinois Journal of Mathematics . Nature 180, 70 (1957). https://doi.org/10.1038/180070b0
Issue Date:
DOI: https://doi.org/10.1038/180070b0