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New Thinking in School Mathematics. Nature 191, 335 (1961). https://doi.org/10.1038/191335b0
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DOI: https://doi.org/10.1038/191335b0
Nature volume 191, page 335 (1961)
New Thinking in School Mathematics. Nature 191, 335 (1961). https://doi.org/10.1038/191335b0
Issue Date:
DOI: https://doi.org/10.1038/191335b0