Abdil Majeed, Ahmed R. “Studying of Structural Properties of ZnxNi1-X-yCuyFe2O4 Spinel Ferrite Using XRD Powder”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 27, no. 3, Apr. 2017, pp. 164-9, https://jih.uobaghdad.edu.iq/index.php/j/article/view/274.