Balaji, V, S Ravi, and P Naveen Chandran. 2018. “Optimization on Cryogenic Co2 Machining Parameters of AISI D2 Steel Using Taguchi Based Grey Relational Approach and TOPSIS”. International Journal of Engineering and Technology 7 (3.12): 885-93. https://doi.org/10.14419/ijet.v7i3.12.16556.