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Research supported by NRC Grant A7256
Research supported by University of Waterloo Research Grant 131-7052
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Burris, S., Lawrence, J. Definable principal congruences in varieties of groups and rings. Algebra Universalis 9, 152–164 (1979). https://doi.org/10.1007/BF02488027
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DOI: https://doi.org/10.1007/BF02488027