Uwaheren, O. A., A. F. Adebisi, and O. A. Taiwo. 2020. “Perturbed Collocation Method For Solving Singular Multi-Order Fractional Differential Equations of Lane-Emden Type”. Journal of the Nigerian Society of Physical Sciences 2 (3), 141-48. https://doi.org/10.46481/jnsps.2020.69.