Mendoza, L., Carballa, M., Sitorus, B., Pieters, J., & Verstraete, W. (2009). Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries. Electronic Journal of Biotechnology, 12(2), 0–0. Retrieved from https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v12n2-8