Alam, Md. M. M., et al. “Free Convection from a Vertical Permeable Circular Cone With Pressure Work and Non-Uniform Surface Temperature”. Nonlinear Analysis: Modelling and Control, vol. 12, no. 1, Jan. 2007, pp. 21-32, https://doi.org/10.15388/NA.2007.12.1.14719.