P. K. Raul, B. Das, R. R. Devi, and S. K. Dwivedi, “Nanoscale Copper II Oxide An Efficient and Reusable Adsorbent for Removal of Nickel II from Contaminated Water”, Def. Life. Sc. Jl., vol. 6, no. 2, pp. 146–154, Jun. 2021.