Yahaya, Jibrin Danjuma, Abraham Ayegba Alfa, Muhammed Raji, and Momohjimoh Abdulsalami. 2026. “Unsteady Darcy-Brinkman Axial Flow in a Porous Concentric Annulus: A Semi-Analytical Riemann-Sum Approach”. FUDMA JOURNAL OF SCIENCES 10 (10): 269-75. https://doi.org/10.33003/fjs-2026-1010-5506.