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ARTICLE PDF ADDITIONAL INFORMATION The online version of the original article can be found at 10.1038/167516b0 RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS

ARTICLE Erratum. _Nature_ 167, 589 (1951). https://doi.org/10.1038/167589e0 Download citation * Issue Date: 14 April 1951 * DOI: https://doi.org/10.1038/167589e0 SHARE THIS ARTICLE Anyone

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