Grey water treatment in upflow anaerobic sludge blanket (UASB) reactor at different temperatures Elmitwalli, Tarek A. Otterpohl, Ralf 2011 - TUHH Open Research
Anaerobic digestion potential for ecological and decentralised sanitation in urban areas Elmitwalli, Tarek A. Feng, Yucheng Behrendt, Joachim Otterpohl, Ralf 2006 - TUHH Open Research