Mahmood, Hassan A., and Ayad M. Ramadan. “A New Theorem for Lower Bounds in NP-Hard Multi-Objective Scheduling Problems”. IRAQI JOURNAL OF STATISTICAL SCIENCES 22, no. 2 (November 30, 2025): 96–101. Accessed January 22, 2026. https://stats.uomosul.edu.iq/index.php/stats/article/view/54081.