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ARTICLE PDF RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Erratum. _Nature_ 230, 264 (1971). https://doi.org/10.1038/230264c0 Download citation * Issue
Date: 26 March 1971 * DOI: https://doi.org/10.1038/230264c0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a
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