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This work was supported in part by National Research Council of Canada, grant no. A-8775.
The second author was on leave at Memorial University of Newfoundland on an exchange program by NRC (Canada) and CNPq (Brazil) while this work was done.
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Parmenter, M.M., Polcino Milies, C. Isomorphic group rings of direct products. Arch. Math 31, 11–14 (1978). https://doi.org/10.1007/BF01226410
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DOI: https://doi.org/10.1007/BF01226410