F. Valdés, E. Muñoz, R. Chamy, G. Ruiz-Filippi, C. Vergara, and D. Jeison, “Effect of sulphate concentration and sulphide desorption on the combined removal of organic matter and sulphate from wastewaters using expanded granular sludge bed (EGSB) reactors”, Electron. J. Biotechnol., vol. 9, no. 4, pp. 0–0, Jul. 2006.