https://uomosul.edu.iq/science/%d8%a7%d9%84%d8%a7%d8%b9%d9%84%d8%a7%d9%86-%d8%b9%d9%86-%d9%85%d9%88%d8%b9%d8%af-%d8%a7%d9%84%d8%a7%d9%85%d8%aa%d8%ad%d8%a7%d9%86-%d8%a7%d9%84%d8%aa%d9%86%d8%a7%d9%81%d8%b3%d9%8a-%d9%84%d9%84%d9%85/