هترة علي, سلامة احمد, and الضاهر نسيم. “Improving Mechanical Properties (Impact Strength and Wear Resistance) of Drilling Teeth Steel and Breakers Hammersr”. Tishreen University Journal -Engineering Sciences Series 43, no. 2 (May 9, 2021). Accessed December 10, 2024. https://journal.tishreen.edu.sy/index.php/engscnc/article/view/10552.