Pallavi Senapati, N., and S. Tripathy. “Application of a Hybrid Approach Using PCA Based TOPSIS Method for Multi Objective Optimization of EDM Process Parameters During Machining of H11 Die Steel Using P M Processed Metal Matrix Composite”. International Journal of Engineering & Technology, vol. 7, no. 4.39, Dec. 2018, pp. 901-6, https://doi.org/10.14419/ijet.v7i4.39.27726.