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Bell, H.E., Klein, A.A. & Kappe, LC. An Analogue for Rings of a Group Problem of P. Erdős and B. H. Neumann. Acta Mathematica Hungarica 77, 57–67 (1997). https://doi.org/10.1023/A:1006531605931
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DOI: https://doi.org/10.1023/A:1006531605931