محمد زكي شيت الصفار ل. (2007) “On MP–rings and DS–ringsLugen .M.Zake.Sheet Al-Sufar”, College of Basic Education Research Journal, 5(3), pp. 243–253. Available at: https://stats.uomosul.edu.iq/index.php/berj/article/view/39226 (Accessed: 26 October 2025).