Hamdan, Rafidah, Nur Amira Atierah Mohammed Shaikhani, and Nur Ain Nazirah Mohd Arshad. 2020. “Aerobic-Anoxic Filter For Nitrogen Removal From Domestic Wastewater: A Comparison Study”. Recent Trends in Civil Engineering and Built Environment 1 (1):133-41. https://publisher.uthm.edu.my/periodicals/index.php/rtcebe/article/view/237.