H. MAHMOOD, A.; H. SADOON, L. Existence of a Solution of a Certain Volterra –Fredholm Integro Differential Equations. Journal of Education and Science, [S. l.], v. 25, n. 3, p. 62–67, 2012. DOI: 10.33899/edusj.2012.59190. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/42107. Acesso em: 10 sep. 2025.