https://uomosul.edu.iq/science/%d8%a5%d9%8a%d9%81%d8%a7%d8%af-%d8%a7%d9%84%d8%af%d9%83%d8%aa%d9%88%d8%b1-%d9%86%d9%88%d9%81%d9%84-%d9%8a%d9%88%d8%b3%d9%81-%d8%ac%d9%85%d9%8a%d9%84-%d8%a3%d8%b3%d8%aa%d8%a7%d8%b0-%d9%85%d8%b3%d8%a7/