Logean Qadri Al-Karam, and Sadeer M.Majeed. “Evaluation the Mechanical Properties of PMMA / ZrO2 Nanoparticles for Dental Application”. International Journal of Research in Pharmaceutical Sciences, vol. 10, no. 3, Aug. 2019, pp. 2000-5, https://ijrps.com/home/article/view/3960.