Quasi Hamiltonian semigroups Alessandra Cherubini; Ada Varisco — 1983 Czechoslovak Mathematical Journal
Semigroups and rings whose proper one-sided ideals are power joined Alessandra Cherubini; Ada Varisco — 1984 Czechoslovak Mathematical Journal
Semigroups whose proper subsemigroups are duo Alessandra Cherubini; Ada Varisco — 1984 Czechoslovak Mathematical Journal