Barhoum, Afif. “Studying the Effects of Gas Heat Treatment on the Distribution of the Doping Elements on the Surface Layer of Titanium Alloys BT9”. Tishreen University Journal -Basic Sciences Series 40, no. 5 (November 14, 2018). Accessed May 2, 2024. https://journal.tishreen.edu.sy/index.php/bassnc/article/view/4634.