Fadhil, H. (2026). Existence, Multiplicity, and Spectral Approximation for Nonlinear Caputo FBVPs: A Fixed-Point and Operational Matrix Approach. Journal of Al-Qadisiyah for Computer Science and Mathematics, 18(3), Math 159–169. https://doi.org/10.29304/jqcsm.2026.18.32888