A. Gumilar, M. Syafila, M. Handajani, I. Anggamulia, and S. Hidayat, “Wastewater Processing Technology Opportunities for Palm Oil Mill Effluent as a Raw Material for Renewable Bioenergy”, J. Eng. Technol. Sci., vol. 54, no. 3, p. 220313, Jun. 2022.