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Supported by the Natural Sciences and Engineering Research Council of Canada, Grant No. A3961.
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Bell, H.E., Guzmán, F. & Kappe, LC. Ring analogues of Baer's norm and P. Hall's margins. Arch. Math 55, 342–354 (1990). https://doi.org/10.1007/BF01198472
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DOI: https://doi.org/10.1007/BF01198472