Gaire, Parash, and Rabin Maharjan. “Effect of Copper on Hydrogenotrophic Denitrification: A Review”. International Journal on Engineering Technology and Infrastructure Development 2, no. 1 (August 1, 2025): 73–80. Accessed December 6, 2025. https://www.nepjol.info/index.php/injetindev/article/view/82453.