Semigroup Forum · 1986 · 27 citations · 6 references
Natural SciencesMathematicsSet TheoryGroup TheoryFree GroupsSemigroup Theory
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The free completely regular semigroup on a set
A. H. Clifford · Journal of Algebra · 1979 · 63 citations
On the varieties of completely regular semigroups
Mario Petrich · Semigroup Forum · 1982 · 26 citations
Free completely regular semigroups
Peter Trotter · Glasgow Mathematical Journal · 1984 · 24 citations · Full text