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Facing up to demography. Nature 269, 457 (1977). https://doi.org/10.1038/269457a0
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DOI: https://doi.org/10.1038/269457a0
Nature volume 269, page 457 (1977)
Facing up to demography. Nature 269, 457 (1977). https://doi.org/10.1038/269457a0
Published:
Issue Date:
DOI: https://doi.org/10.1038/269457a0