S. Shivakumara and C. Nanjundappa, “Onset of convection in a sparsely packed porous layer with throughflow”, Arch. Mech., vol. 53, no. 3, pp. 219–241, Jun. 2001, Accessed: Mar. 03, 2026. [Online]. Available: http://am.ippt.gov.pl/index.php/am/article/view/v53p219