Ibrahim, G. A., A. Hamni, and S. M. P. Lestari. “Analysis of Surface Roughness Value When Drilling Magnesiumaz31 Using Taghuci Method”. International Series on Interdisciplinary Science and Technology, vol. 2, no. 2, Jan. 2019, pp. 71-74, doi:10.23960/ins.v2i2.82.