Upadhyay, Subrahamanyam, and K.N. Rai. “Collocation Method Applied to Unsteady Flow of Gas through a Porous Medium”. International Journal of Applied Mathematical Research 3, no. 3 (July 6, 2014): 251–259. Accessed April 29, 2024. https://www.sciencepubco.com/index.php/ijamr/article/view/2924.