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ARTICLE PDF ADDITIONAL INFORMATION The online version of the original article can be found at 10.1038/231323a0 RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS
ARTICLE Erratum. _Nature_ 232, 72 (1971). https://doi.org/10.1038/232072a0 Download citation * Issue Date: 02 July 1971 * DOI: https://doi.org/10.1038/232072a0 SHARE THIS ARTICLE Anyone you
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