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Wirsing, E. Bemerkung zu der Arbeit über vollkommene Zahlen in Math. Ann. Bd. 133, S. 431–438 (1957). Math. Ann. 137, 316–318 (1959). https://doi.org/10.1007/BF01360967
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DOI: https://doi.org/10.1007/BF01360967