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. [انترنت]. 1 نوفمبر، 2014 [وثق 19 مايو، 2024];18(6):202-11. موجود في: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/931