محمد زكي شيت الصفار ل. On MP–rings and DS–ringsLugen .M.Zake.Sheet Al-Sufar. BERJ [Internet]. 2007 Aug. 1 [cited 2025 Oct. 26];5(3):243-5. Available from: https://stats.uomosul.edu.iq/index.php/berj/article/view/39226