“Free Convection in an Inclined Concentric Annular Square Cavities Filled With Porous Medium and Heated By Non-Uniform Temperature”, alkej, vol. 6, no. 3, pp. 45–60, Sep. 2010, Accessed: Dec. 23, 2024. [Online]. Available: https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/502