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This work is supported by NSERC Grant No. A-5300 and a DFG travel fellowship.
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Ritter, J., Sehgal, S. Isomorphism of group rings. Arch. Math 40, 32–39 (1983). https://doi.org/10.1007/BF01192749
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DOI: https://doi.org/10.1007/BF01192749