A. Șerbencu, V. Mînzu, and A. Șerbencu, “An Ant Colony System based metaheuristic for solving single machine scheduling problem”, The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, vol. 30, pp. 19-24, Nov. 2007.