Embedding semigroups in groups. A geometrical approach. Krstić, Sava — 1985 Publications de l'Institut Mathématique. Nouvelle Série
Algorithmic problems related to the direct product of groups. Božović, Nataša; Krstić, Sava — 1985 Publications de l'Institut Mathématique. Nouvelle Série
Two Results on Associativity of Composite Operations in Groups Sava Krstić — 1983 Publications de l'Institut Mathématique
On Quasigroup Varieties Closed Under Isotopy Sava Krstić — 1986 Publications de l'Institut Mathématique
Equivariant outer space and automorphisms of free-by-finite groups. Karen Vogtmann; Sava Krstic — 1993 Commentarii mathematici Helvetici