Martin Kuřil (1997)
Archivum Mathematicum
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A multiplication of e-varieties of regular -solid semigroups by inverse semigroup varieties is described both semantically and syntactically. The associativity of the multiplication is also proved.
M. Petrich (1982)
Semigroup forum
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L. Polák (1985)
Semigroup forum
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V.V. Rasin (1979)
Semigroup forum
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Bedřich Pondělíček (1991)
Mathematica Bohemica
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The paper contains characterizations of semigroup varieties whose semigroups with one generator (two generators) are permutable. Here all varieties of regular -semigroups are described in which each semigroup with two generators is permutable.
J. Kadourek (1992)
Semigroup forum
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N.R. Reilly, S. Zhang (1996)
Semigroup forum
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