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Communicated by N.R. Reilly
Research supporced by NSERC of Canada
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Gerhard, J.A., Petrich, M. All varieties of regular orthogroups. Semigroup Forum 31, 311–351 (1985). https://doi.org/10.1007/BF02572660
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DOI: https://doi.org/10.1007/BF02572660