H. Mahmood, A., and L. H . Sadoon. “Existence and Uniqueness of Solutions for Certain Nonlinear Mixed Type Integral and Integro-Differential Equations”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 9, no. 1, June 2012, pp. 163-7, doi:10.33899/csmj.2012.163680 .