On the spectra of group commutators.
Bollettino della Unione matematica italiana, Série 3, Tome 15 (1960) no. 3, pp. 379-383.

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Putnam, C. R. On the spectra of group commutators.. Bollettino della Unione matematica italiana, Série 3, Tome 15 (1960) no. 3, pp. 379-383. https://geodesic-test.mathdoc.fr/item/BUMI_1960_3_15_3_a4/

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