Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis Dahkki Ardila-Barragán, Marco Antonio, Valdés-Rentería, Carlos Francisco, Pecha, Brennan, López-Díaz, Alfonso, Gil-Lancheros, Eduardo, Vanegas-Chamorro, Marley Cecilia, Camporredondo-Saucedo, Jesús Emilio, Lozano-Gómez, Luis Fernando