https://uomosul.edu.iq/science/%d8%a7%d9%84%d9%85%d8%a4%d8%aa%d9%85%d8%b1-%d8%a7%d9%84%d8%b9%d9%84%d9%85%d9%8a-%d8%a7%d9%84%d8%af%d9%88%d9%84%d9%8a-%d8%a7%d9%84%d8%ab%d8%a7%d9%86%d9%8a-%d9%84%d8%b9%d9%84%d9%88%d9%85-%d8%a7%d9%84-2/