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- [4] EQUATIONAL CLASSES OF COMMUTATIVE SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 16 (04): : 661 - &
- [5] LATTICE OF EQUATIONAL CLASSES OF COMMUTATIVE SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1970, 17 (04): : 651 - &
- [6] LATTICE OF EQUATIONAL CLASSES OF COMMUTATIVE SEMIGROUPS CANADIAN JOURNAL OF MATHEMATICS, 1971, 23 (05): : 875 - &
- [9] Definability for equational theories of commutative groupoids Czechoslovak Mathematical Journal, 2012, 62 : 305 - 333