Nugroho, R., H. Takanashi, M. Hirata, and T. Hano. “Application of Autotrophic Denitrification to Nitrate-Contaminated Industrial Wastewater”. ASEAN Journal of Chemical Engineering, Vol. 3, no. 1, Dec. 2003, pp. 1-8, https://journal.ugm.ac.id/v3/AJChE/article/view/7533.