Zulkarnaini, Z., A. Nur, and W. Ermaliza. “Nitrogen Removal in the Anammox Biofilm Reactor Using Palm Fiber As Carrier in Tropical Temperature Operation”. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, vol. 10, no. 2, Dec. 2019, pp. 7-15, doi:10.21771/jrtppi.2019.v10.no2.p7-15.