List of Articles perturbation term Open Access Article Abstract Page Full-Text 1 - Shifted Chebyshev approach for the solution of delay Fredholm and Volterra integro-differential equations via perturbed Galerkin method Kazeem Issa Jafar Biazar Babatunde Yisa Open Access Article Abstract Page Full-Text 2 - Numerical solution of integro-differential equations via pertubed-Gegenbauer, Jacobi polynomials and Galerkin method Kazeem Issa Kazeem Aliu Kazeem Arokoola Kazeem Micah