Some constructions related to Rees matrix rings. Petrich, M. — 2002 Acta Mathematica Universitatis Comenianae. New Series
Correction to "A simple construction of semigroups all of whose subsemigroups are left ideals." M. Petrich — 1975 Semigroup forum
A simple construction of semigroups all of whose subsemigroups are left ideals. M. Petrich — 1972 Semigroup forum
The semigroup generated by certain operators on the congruence lattice of a Clifford semigroup. M. Petrich — 1992 Semigroup forum
Certain Rees matrix semigroups with universal properties. M. Petrich; N. Reilly — 1981 Semigroup forum
A new approach to orders in simple rings with minimal one-sided ideals. M. Petrich; V. Gould — 1990 Semigroup forum