Romero-Salcedo, Eliana, et al. “A Predictive Model for the Anisotropy Index of Semi-Coke Derived from the Properties of Colombia’s Eastern Cordillera Coals”. Ingeniería Y Ciencia, vol. 16, no. 32, Nov. 2020, pp. 109-34, https://doi.org/10.17230/ingciencia.16.32.5.