Mariño-Martínez, Jorge Eliécer, et al. “Degasification possibilities evaluation in Socotá coal mines (Boyacá, Colombia)”. Revista Facultad de Ingeniería, vol. 25, no. 43, Sept. 2016, pp. 59-71, doi:10.19053/01211129.v25.n43.2016.5298.