Ahmed Abdulameer Abduljabbar, et al. “Evaluation of the Effect of Nano and Micro Hydroxyapatite Particles on the Impact Strength of Acrylic Resin: In Vitro Study”. Journal of Techniques, vol. 5, no. 3, Sept. 2023, pp. 213-7, doi:10.51173/jt.v5i3.1476.