Arup Kumar Biswas, Wasu Suksuwan, Khamphe Phoungthong, and Makatar Wae-hayee. “Effect Of Equivalent Ratio (ER) On the Flow and Combustion Characteristics in A Typical Underground Coal Gasification (UCG) Cavity”. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 86, no. 2, Mar. 2024, pp. 28-38, https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/article/view/8143.