Morlu G. F. Stevens. “Removal of Toxic Nitrate and Nitrite from Wastewater by Valuarized Fish Scales Waste Remains”. Global Journal of Science Frontier Research 17, no. B2 (July 15, 2017): 25–30. Accessed April 27, 2024. https://journalofscience.org/index.php/GJSFR/article/view/2112.