Islam, M. S., R. Baini, S. J. Tanjong, M. A. M. Said, and E. J. Joy. “Effects of Hydraulic Retention Time and Solid Retention Time of POME on COD Removal Efficiency”. International Journal of Automotive and Mechanical Engineering, vol. 15, no. 2, June 2018, p. 5347, https://journal.ump.edu.my/ijame/article/view/21.