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ARTICLE PDF ADDITIONAL INFORMATION The online version of the original article can be found at 10.1038/192262a0 RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS
ARTICLE Erratum. _Nature_ 192, 802 (1961). https://doi.org/10.1038/192802f0 Download citation * Issue Date: 02 December 1961 * DOI: https://doi.org/10.1038/192802f0 SHARE THIS ARTICLE Anyone
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