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%b4%d8%a7%d8%b1%d9%83-%d9%81%d9%8a-%d9%88%d9%82%d9%81%d8%a9-%d9%84%d9%84%d8%ad%d8%af%d8%a7%d8%af-%d8%b9%d9%84%d9%89-%d8%a3%d8%b1/