Idempotent separating congruences on an orthodox semigroup via the least inverse congruence. Krgović, Dragica N. — 1993 Publications de l'Institut Mathématique. Nouvelle Série
Completely regular and orthodox congruences on regular semigroups. Alimpić, Branka P.; Krgović, Dragica N. — 1993 Publications de l'Institut Mathématique. Nouvelle Série
On 0-Minimal (0, 2)-Bi-Ideals Of Semigroups Dragica N. Krgović — 1982 Publications de l'Institut Mathématique
On 0-Minimal Bi-Ideals Of Semigroups Dragica N. Krgović — 1980 Publications de l'Institut Mathématique
Completely Regular and Orthodox Congruences on Regular Semigroups Branka Alimpić; Dragica N. Krgović — 1993 Publications de l'Institut Mathématique