https://uomosul.edu.iq/finearts/%d9%85%d9%86%d8%a7%d9%82%d8%b4%d8%a9-%d8%b1%d8%b3%d8%a7%d9%84%d8%a9-%d8%a7%d9%84%d9%85%d8%a7%d8%ac%d8%b3%d8%aa%d9%8a%d8%b1-%d9%88%d8%a7%d9%84%d9%85%d9%88%d8%b3%d9%88%d9%85%d8%a9-enhancing-robusfness-2/