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support RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Technology Gap. _Nature_ 213, 1060 (1967). https://doi.org/10.1038/2131060a0 Download citation *
Published: 01 March 1967 * Issue Date: 18 March 1967 * DOI: https://doi.org/10.1038/2131060a0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content:
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