R. Kumar Maurya, M. S.Niranjan, and N. Kumar Maurya, “Optimum Selection of Process Parameters in EN-31Alloy Steel for Surface Roughness and MRR using Taguchi Method”, IJET, vol. 7, no. 4.39, pp. 447–453, Dec. 2018, doi: 10.14419/ijet.v7i4.39.24122.