“Variable viscosity and thermal conductivity effects on heat transfer by natural convection from a cone and a wedge in porous media”, Arch. Mech., vol. 55, no. 4, pp. 345–356, Sep. 2003, Accessed: May 14, 2025. [Online]. Available: https://am3.ippt.pan.pl/index.php/am/article/view/v55p345