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Professor H.-J. Kanold zum sechzigsten Geburtstag gewidmet
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Erdös, P. Bemerkungen zu einer Aufgabe in den Elementen. Arch. Math 27, 159–163 (1976). https://doi.org/10.1007/BF01224655
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DOI: https://doi.org/10.1007/BF01224655