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%b5%d9%84-%d8%b9%d9%84%d9%89-%d8%a7%d9%84%d9%85%d8%b1%d9%83%d8%b2-%d8%a7%d9%84%d8%ab%d8%a7%d9%86%d9%8a-%d8%b6%d9%85%d9%86/