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Arrow on the Ground. Nature 218, 511 (1968). https://doi.org/10.1038/218511a0
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DOI: https://doi.org/10.1038/218511a0
Nature volume 218, page 511 (1968)
Arrow on the Ground. Nature 218, 511 (1968). https://doi.org/10.1038/218511a0
Published:
Issue Date:
DOI: https://doi.org/10.1038/218511a0