E-unitary R-unipotent semigroups.
Correction and supplement to "On a pull-back diagram for orthodox semigroups".
On a pull-back diagram for orthodox semigroups.
Colloquium on semigroups, Szeged August 24-28, 1987.
The bifree regular E-solid semigroups.
On Takizawa's construction for E-unitary R-unipotent semigroups
Problems (Raised at the Colloquium on Semigroups, Szeged, 15-19 August, 1994).
A new approach in the theory of orthodox semigroups.
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