https://uomosul.edu.iq/science/%d8%aa%d8%b3%d8%ac%d9%8a%d9%84-%d8%b9%d8%b2%d9%84%d8%aa%d9%8a%d9%86-%d8%ac%d8%af%d9%8a%d8%af%d8%aa%d9%8a%d9%86-%d8%aa%d8%a7%d8%a8%d8%b9%d8%a9-%d9%84%d9%84%d8%ac%d9%86%d8%b3-%d8%a7%d9%84%d8%a8%d9%83-2/