“Free Convection in an Inclined Concentric Annular Square Cavities Filled With Porous Medium and Heated By Non-Uniform Temperature”. Al-Khwarizmi Engineering Journal 6, no. 3 (September 1, 2010): 45–60. Accessed April 30, 2025. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/502.