Shivakumara, I.S., S.P. Suma, and Krishna B. Chavaraddi. 2006. “Onset of Surface-Tension-Driven Convection in Superposed Layers of Fluid and Saturated Porous Medium”. Archives of Mechanics 58 (2): 71-92. http://am.ippt.gov.pl/index.php/am/article/view/v58p71.