Kanlayasiri, Kannachai, Prajak Jattakul, and Niwat Mookam. 2021. “Machinability of Tool Steels Machined by Electric-Discharge Machining”. SNRU Journal of Science and Technology 14 (1), 25-31. https://ph01.tci-thaijo.org/index.php/snru_journal/article/view/244172.