[1]
Contreras, E., Leal, E. y Martínez, M. 2010. Effect of temperature, oxidation time and substrate: oxidant agent ratio in the yield and composition of humic acids derived from coal, monitored by 1H NMR and FT-ir. Revista Técnica de la Facultad de Ingeniería. Universidad del Zulia. 27, 2 (nov. 2010).