Dakhel Ahmed H, Flayeh Hasan M. The Effect of Adding Alumina Phases (alpha and amorphous) to Improve the Mechanical Properties (Compressive Strength and Hardness) of Polyester Matrix Composites. J. eng. sustain. dev. [Internet]. 2014 Nov. 1 [cited 2025 May 4];18(6):202-11. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/931