Mirko Barz. (2009) SEWAGE SLUDGE FROM WASTEWATER TREATMENT AS ENERGY SOURCE. <i>International Journal of Renewable Energy</i>, <i>Vol. 4</i>(No.1), 1-11.Mirko Barz. "SEWAGE SLUDGE FROM WASTEWATER TREATMENT AS ENERGY SOURCE". International Journal of Renewable Energy Vol. 4 (2009):1-11.Mirko Barz. SEWAGE SLUDGE FROM WASTEWATER TREATMENT AS ENERGY SOURCE. School of Renewable Energy Technology:ม.ป.ท. 2009.