The largest proper regular ideal of S ( X ) Kenneth D., Jr. Magill (1996) Czechoslovak Mathematical Journal
The least inverse and orthodox congruences on a completely regular semigroup. P.R. Jones (1983) Semigroup forum
The least separative congruence on a weakly commutative semigroup Attila Nagy (1982) Czechoslovak Mathematical Journal
The Maximal Semilattice Decomposition of a Semigroup, Radicals and Nilpotency Robert Šulka (1970) Matematický časopis
The minimum reflexive subsemigroup generated generated by the sat of idempotents of a regular subsemigroup. F. E. Masat (1977/1978) Semigroup forum
The natural partial order on an R-cancelative semigroup B. Stamenković, P. V. Protić (1987) Matematički Vesnik
The orderability of idempotent semigroups Toru Saitô (1971/1972) Séminaire Dubreil. Algèbre et théorie des nombres
The quasi-uniserial semigroups without zero, their arithmetics and their algebras. E.A. Behrens (1971) Semigroup forum