I. Khahtan Sabree and O. Saleh Mahdi, “Characterization of Zirconia- Hydroxyapatite Nanocomposites for Orthopedic and Dental Applications”, IJET, vol. 7, no. 4.19, pp. 926–930, Nov. 2018, doi: 10.14419/ijet.v7i4.19.28072.