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Dr Ellen Gleditsch. Nature 222, 101 (1969). https://doi.org/10.1038/222101b0
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DOI: https://doi.org/10.1038/222101b0
Nature volume 222, page 101 (1969)
Dr Ellen Gleditsch. Nature 222, 101 (1969). https://doi.org/10.1038/222101b0
Issue Date:
DOI: https://doi.org/10.1038/222101b0