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Professor H. L. Hawkins. Nature 221, 294 (1969). https://doi.org/10.1038/221294a0
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DOI: https://doi.org/10.1038/221294a0
Nature volume 221, page 294 (1969)
Professor H. L. Hawkins. Nature 221, 294 (1969). https://doi.org/10.1038/221294a0
Issue Date:
DOI: https://doi.org/10.1038/221294a0