Mshandete, A. M., L. Björnsson, A. K. Kivaisi, M. S. T. Rubindamayugi, and B. Mattiasson. “Performance of Biofilm Carriers in Anaerobic Digestion of Sisal Leaf Waste Leachate”. Electronic Journal of Biotechnology, vol. 11, no. 1, Jan. 2008, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v11n1-7.