Ibraheem Khalaf, Hassanein. 2021. “EFFECT OF ALUMINUM CONTENT ON THE HARDNESS AND MACHINABILITY OF BRASS ALLOY USED IN OXYGEN CYLINDER VALVE”. THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 21 (3):213-20. https://iqjfmme.com/index.php/jmme/article/view/562.