https://uomosul.edu.iq/computerscience/%d9%85%d9%88%d8%b3%d9%85-%d8%ab%d9%82%d8%a7%d9%81%d9%8a-%d9%84%d9%82%d8%b3%d9%85-%d8%a7%d9%84%d8%a8%d8%b1%d9%85%d8%ac%d9%8a%d8%a7%d8%aa21-4-2019/