A remark on intra-regular semigroups.
An analogue of Litoff's Theorem.
Quasi-ideals in rings and semigroups
A characterization of dual semigroups without nilpotent ideals.
On completely regular semigroups.
Über reguläre Z-Ringe
Über Ringe mit gemeinsamer multiplikativer Halbgruppe.
A generalization of Green's relations in semigroups.
Remarks on canonical quasi-ideals in semigroups
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