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An erratum to this article is available at http://dx.doi.org/10.1007/BF03022999.
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Lang, S. Updating the history of circular A-21. The Mathematical Intelligencer 6, 28–31 (1984). https://doi.org/10.1007/BF03026733
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DOI: https://doi.org/10.1007/BF03026733