Kamal, S.A. et al. 2012. Pre-Treatment Effect of Palm Oil Mill Effluent (POME) during Hydrogen Production by a Local Isolate Clostridium butyricum. International Journal on Advanced Science, Engineering and Information Technology. 2, 4 (Aug. 2012), 325–331. DOI:https://doi.org/10.18517/ijaseit.2.4.214.