Das, Partha Protim, Sunny Diyaley, Shankar Chakraborty, and Ranjan Kumar Ghadai. 2019. “Multi-Objective Optimization of Wire Electro Discharge Machining (WEDM) Process Parameters Using Grey-Fuzzy Approach”. Periodica Polytechnica Mechanical Engineering 63 (1):16-25. https://doi.org/10.3311/PPme.12167.