https://uomosul.edu.iq/science/%d9%83%d9%84%d9%8a%d8%a9-%d8%a7%d9%84%d8%b9%d9%84%d9%88%d9%85-%d8%aa%d8%ad%d8%aa%d9%81%d9%8a-%d8%a8%d8%b7%d9%84%d8%a8%d8%aa%d9%87%d8%a7-%d8%a7%d9%84%d8%ae%d8%b1%d9%8a%d8%ac%d9%8a%d9%86-%d9%84%d9%84/