W ABD RAHMAN, WAN NUR AZLIN, and R. HAMDAN. “Nitrification-Denitrification Process in a Combined AVFF and UAHFF System for Ammonia Removal”. Recent Trends in Civil Engineering and Built Environment 2, no. 1 (June 6, 2021): 438–446. Accessed May 20, 2024. https://publisher.uthm.edu.my/periodicals/index.php/rtcebe/article/view/1571.