Romao, E. C., and L. H. P. de Assis. “Numerical Simulation of 1D Unsteady Heat Conduction-Convection in Spherical and Cylindrical Coordinates by Fourth-Order FDM”. Engineering, Technology & Applied Science Research, vol. 8, no. 1, Feb. 2018, pp. 2389-92, doi:10.48084/etasr.1724.