Telles Benatti, C., C. R. Granhen Tavares, B. Prado Dias Filho, and M. da L. Ribeiro Moitinho. “Operation of a Slow Rate Anaerobic Digester Treating Municipal Secondary Sludge”. Electronic Journal of Biotechnology, vol. 5, no. 3, Dec. 2002, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v5n3-1.