https://uomosul.edu.iq/science/%d9%88%d8%b1%d8%b4%d8%a9-%d8%b9%d9%85%d9%84-%d9%84%d9%85%d9%85%d8%ab%d9%84%d9%8a-%d9%88%d8%ad%d8%af%d8%a9-%d8%a7%d9%84%d8%aa%d8%b3%d8%ac%d9%8a%d9%84-%d9%81%d9%8a-%d8%a3%d9%82%d8%b3%d8%a7%d9%85-%d9%83/