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US drops back in biology and maths. Nature 282, 433 (1979). https://doi.org/10.1038/282433b0
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DOI: https://doi.org/10.1038/282433b0
Nature volume 282, page 433 (1979)
US drops back in biology and maths. Nature 282, 433 (1979). https://doi.org/10.1038/282433b0
Published:
Issue Date:
DOI: https://doi.org/10.1038/282433b0