https://uomosul.edu.iq/science/%d9%82%d8%b3%d9%85-%d8%a7%d9%84%d9%81%d9%8a%d8%b2%d9%8a%d8%a7%d8%a1-%d9%8a%d9%82%d9%8a%d9%85%d9%8f-%d9%86%d8%af%d9%88%d8%a9%d9%8d-%d8%b9%d9%84%d9%85%d9%8a%d8%a9%d9%8d-%d8%b9%d9%86-%d8%a7%d9%84/