J. H. Mbaya, and N. Amin. “Modelling Unsteady Flow of Gas and Heat Transfer in Producing Wells”. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 6, no. 1, Feb. 2015, pp. 19-33, https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/2537.