Pérez-Bayer, Juan Fernando, Rolando Barrera-Zapata, and Carlos Alberto Salazar-Jiménez. 2016. “Effect of Colombian Coal Rank and Its Feeding Technology on Substitute Natural Gas Production by Entrained Gasification”. Revista Facultad De Ingeniería 25 (41):41-53. https://doi.org/10.19053/01211129.4136.