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DUFF, J. Prof. P. J. Heawood, O.B.E.. Nature 175, 368 (1955). https://doi.org/10.1038/175368a0
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DOI: https://doi.org/10.1038/175368a0
Nature volume 175, page 368 (1955)
DUFF, J. Prof. P. J. Heawood, O.B.E.. Nature 175, 368 (1955). https://doi.org/10.1038/175368a0
Issue Date:
DOI: https://doi.org/10.1038/175368a0