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This work was done while the author was visiting the University of Alberta, and was supported by Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq.
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Gonçalves, J.Z. Integral group rings whose group of units is solvable an elementary proof. Bol. Soc. Bras. Mat 16, 1–9 (1985). https://doi.org/10.1007/BF02584797
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DOI: https://doi.org/10.1007/BF02584797