“STUDY OF FLEXURAL AND IMPACT PROPERTIES OF NANO-HYBRID COMPOSITES MATERIALS BY USING POLY METHYL METHACRYLATE (PMMA) MATRIX”. Journal of Engineering and Sustainable Development, vol. 23, no. 3, May 2019, pp. 114-27, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/270.