https://uomosul.edu.iq/petroleumengineering/%d8%af%d9%88%d8%b1%d8%a9-%d8%aa%d8%af%d8%b1%d9%8a%d8%a8%d9%8a%d8%a9-%d8%a8%d8%b9%d9%86%d9%88%d8%a7%d9%86-petroleum-system-modeling-2/