Pitriani, ., Muh. Fajaruddin Natsir, and Anwar Daud. 2015. “The Effectiveness of EM4 Addition into Anaerob-Aerob Biofilter in the Processing of Wastewater at Hasanuddin University Hospital, Makassar Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 22 (1):178-87. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3845.