Yustiani, Y. M., Nugroho, F. L., Murtadho, F. Z., & Djayadisastra, A. T. (2023). Applying Eco Enzyme to Reduce Chemical Oxygen Demand (COD) Content of Artificial River Water. Journal of Engineering and Technological Sciences, 55(1), 91-97. https://doi.org/10.5614/j.eng.technol.sci.2023.55.1.9