https://uomosul.edu.iq/science/%d8%a7%d9%84%d8%b3%d9%8a%d8%af%d8%a9-%d8%b9%d9%85%d9%8a%d8%af-%d9%83%d9%84%d9%8a%d8%a9-%d8%a7%d9%84%d8%b9%d9%84%d9%88%d9%85-%d8%aa%d9%84%d8%aa%d9%82%d9%8a-%d8%a8%d9%85%d8%ac%d9%85%d9%88%d8%b9%d8%a9/