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This research was supported by KBN grant No. 2P 301035 and the Technical University of Białystok.
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Kepczyk, M., Puczyłowski, E.R. On radicals of rings which are sums of two subrings. Arch. Math 66, 8–12 (1996). https://doi.org/10.1007/BF01323977
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DOI: https://doi.org/10.1007/BF01323977