N. Butrus, R., رعد, A. Azeez, M. and میرنا 2006. Some theorems in existence and oneness of a system of integral - nonlinear differential equations. Journal of Education and Science (JES). 18, 2 (Jun. 2006), 76–89. DOI:https://doi.org/10.33899/edusj.2006.79261.