https://uomosul.edu.iq/science/%d8%a7%d9%86%d8%aa%d9%87%d8%a7%d8%a1-%d8%a3%d8%b9%d9%85%d8%a7%d9%84-%d8%af%d9%88%d8%b1%d8%a9-%d8%a7%d9%84%d8%aa%d8%a3%d9%87%d9%8a%d9%84-%d9%88%d8%a7%d9%84%d8%aa%d9%88%d8%b8%d9%8a%d9%81-%d9%84%d8%b7-3/