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Dedicated to the memory of Andor Kertész
The first author was supported in part by a grant from the University of Nebraska Research Council.
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Leavitt, W.G., Watters, J. Special closure,M-radicals, and relative complements. Acta Mathematica Academiae Scientiarum Hungaricae 28, 55–67 (1976). https://doi.org/10.1007/BF01902494
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DOI: https://doi.org/10.1007/BF01902494