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Vgl. Math. Zeitschr. Bd. 32, S. 315–318 (1930).
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Levi, F. Über die Untergruppen der freien Gruppen. Math Z 37, 90–97 (1933). https://doi.org/10.1007/BF01474565
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DOI: https://doi.org/10.1007/BF01474565