Balaji, V., Ravi, S. and Naveen Chandran, P. (2018) “Optimization on Cryogenic Co2 Machining Parameters of AISI D2 Steel using Taguchi Based Grey Relational Approach and TOPSIS”, International Journal of Engineering & Technology, 7(3.12), pp. 885–893. doi:10.14419/ijet.v7i3.12.16556.