حسن محمد, الحسن محسن, and مصطفى مازن. “Signed Domination Number of Graph”. Tishreen University Journal -Basic Sciences Series 43, no. 2 (May 20, 2021). Accessed May 3, 2024. https://journal.tishreen.edu.sy/index.php/bassnc/article/view/10586.