The kernel relation for regular semigroups

Petrich Mario
2004

The centroid of a semigroup

Petrich Mario
1973

Homomorphisms of a semigroup onto normal bands

Petrich Mario
1966

Restricting idempotents in E-inversive semigroups

Mitsch Heinz, Petrich Mario
2001

A generalization of the Rees theorem in semigroups

Lallement Gérard, Petrich Mario
1969

Semigroups of periodic endomorphisms of a free monoid

Petrich Mario, Reis C. M.
1994

On quasi directly infinite rings

Petrich Mario, Silva Pedro V.
1999

E-unitary covers and varieties of inverse semigroups

Petrich Mario, Reilly Norman Raymund
1983

Congruence lattices on a regular semigroup associated with certain operators

Pastijn Francis J., Petrich Mario
1991

New orders in primitive inverse semigroups

Cegarra Antonio M., Ghroda Nassradin, Petrich Mario
2015