https://uomosul.edu.iq/science/%d8%a7%d9%84%d8%af%d9%83%d8%aa%d9%88%d8%b1-%d8%b9%d8%a8%d8%af-%d8%a7%d9%84%d8%ae%d8%a7%d9%84%d9%82-%d8%a7%d9%8a%d9%88%d8%a8-%d8%a7%d9%84%d8%b1%d8%a7%d9%88%d8%ac%d9%8a-%d9%85%d9%86-%d9%82%d8%b3%d9%85/