Hareem, Hafsa, and Mazhar Iqbal. “Optimal Configuration of An Annular Sector Duct Filled With Porous Media”. Communications in Mathematics and Applications 9, no. 3 (September 25, 2018): 357–375. Accessed August 18, 2025. https://www.journals.rgnpublications.com/index.php/cma/article/view/796.