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Mathematics Teaching. Nature 193, 529 (1962). https://doi.org/10.1038/193529c0
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DOI: https://doi.org/10.1038/193529c0
Nature volume 193, page 529 (1962)
Mathematics Teaching. Nature 193, 529 (1962). https://doi.org/10.1038/193529c0
Issue Date:
DOI: https://doi.org/10.1038/193529c0