فهرست مقالات perturbed-Galerkin method دسترسی آزاد مقاله صفحه چکیده متن کامل 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