Ferreira-Rolón, A., G. Ramírez-Romero, and F. Ramírez-Vives. “GRANULAR SLUDGES METHANOGENIC ACTIVITY INCREASE DUE TO CO2 BUBBLING CALCIUM PRECIPITATION OVER NEJAYOTE”. Revista Mexicana De Ingeniería Química, Vol. 13, no. 2, Feb. 2020, pp. 517-25, http://www.rmiq.org/ojs311/index.php/rmiq/article/view/1343.