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- [33] ORTHODOX CONGRUENCES ON REGULAR SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (01): : A88 - A88
- [39] CERTAIN CONGRUENCES ON ORTHODOX SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (01): : A85 - A86
- [40] CONGRUENCES ON N-SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 16 (07): : 1060 - &