Sulaiman A.B., Hamza M.M. A study on transient flow formation in concentric porous annuli filled with porous material having variable porosity. JOBASR [Internet]. 2025 Jul. 1 [cited 2026 Apr. 21];3(4):151-60. Available from: https://jobasrfudutsinma.com/index.php/ojs-files/article/view/181