Syahri, B., Prasetya, F., Refdinal, R. and Syahrial, S. (2021) “Effect of cutting speed on milling process on surface roughness of ST-37 steel material workpiece”, INVOTEK: Jurnal Inovasi Vokasional dan Teknologi, 21(1), pp. 19-26. doi: https://doi.org/10.24036/invotek.v21i1.766.