1. S. Bogdanović and M. Cirić. Primitive π-regular semigroups,Proc. Japan Acad.,68, Ser A, 10 (1992), 334–337.
2. S. Bogdanović and M. Cirić,Polugrupe, Prosveta (Niš, 1993).
3. S. Bogdanović and M. Cirić, Orthogonal sums of semigroups,Israel J. Math.,90 (1995), 423–428.
4. M. Cirić and S. Bogdanović, Semilattice decompositions of semigroups,Semigroup Forum (to appear).
5. M. Cirić and S. Bogdanović, 0-Archimedean semigroups,Proc. Japan Acad. (to appear).