The royal college of science and technology, glasgow
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ARTICLE PDF RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE The Royal College of Science and Technology, Glasgow. _Nature_ 199, 432 (1963).
https://doi.org/10.1038/199432d0 Download citation * Issue Date: 03 August 1963 * DOI: https://doi.org/10.1038/199432d0 SHARE THIS ARTICLE Anyone you share the following link with will be
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