H. Mahmood A, H. Sadoon L. Existence of a Solution of a Certain Volterra –Fredholm Integro Differential Equations. EDUSJ [Internet]. 2012 Sep. 1 [cited 2025 Aug. 6];25(3):62-7. Available from: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23987