Sandwich sets and partial order.
Comparison of congruences on regular semigroups.
Compact connected spaces supporting topological semigroups.
Relations on the lattice of congruences of a regular semigroup.
Idempotent semigroups generated by threads, I.
A note on idempotents.
Swelling actions of ...-compact semigroups.
Idempotent semigroups generated by threads II.
Alexander Doniphan Wallace on his 68th birthday.
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