Ahmed, K.W. and Hasan, R.M.A. 2017. The effect of addition of barium sulphate nanoparticles on some properties of Acetal resin. Zanco Journal of Medical Sciences (Zanco J Med Sci). 21, 3 (Dec. 2017), 1818–1828. DOI:https://doi.org/10.15218/zjms.2017.039.