Purboputro, Pramuko Ilmu, and Radix Ekaputra. “Analysis of Carburizing Effect Due to Hardness and Microstructure on ST 60 Steel Using Carbon Particle With 80 Mesh”. Urecol Journal. Part E: Engineering, vol. 2, no. 2, Nov. 2022, pp. 47-53, doi:10.53017/uje.176.