Ibrahim F. Waheed, Thuraya Yarb Sabri, Najat A. Dahham, and Faten Haithum Mulud. “Characterization of Calcinated Ni–Cu Ferrite Nanoparticles Synthesized by Citrate-Gel Auto Combustion Technique”. Iraqi Journal of Science, Vol. 62, no. 3, Mar. 2021, pp. 878-8, doi:10.24996/ijs.2021.62.3.19.