On a certain relation for closure operation on a semigroup
A certain equivalence on a semigroup
A contribution to the foundations of network theory using the distribution theory
Green's relations on a compact semigroup
Contribution to the foundations of network theory using the distribution theory, II
Modularity and distributivity of tolerance lattices of commutative inverse semigroups
Note on homomorphisms of direct products of algebras
Atomicity of tolerance lattices of commutative semigroups
On weakly commutative semigroups
On tolerances on periodic semigroups
Modularity and distributivity of tolerance lattices of commutative separative semigroups
On representations of tolerance ordered commutative semigroups
A characterization of semilattices of left or right groups
Tolerance distributive and tolerance modular varieties of commutative semigroups
Tolerance distributive and tolerance Boolean varieties of semigroups
Archimedean equivalence on ordered semigroups
Průměr grafu pologrupy
O jisté pologrupě endomorfismů na jednoduše uspořádané množině. I.
O jisté pologrupě endomorfismů na jednoduše uspořádané množině. II.
Bemerkung zu einer Halbgruppe der Endomorphismen auf einer einfach geordneten Menge
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