“A Novel Optimization of Feed and Spindle Speed Levels for Surface Roughness and Cylindricity Tolerance of the Drilled Holes in Liquid Stir Casted Al6061 Hybrid Metal Matrix Composite Reinforced With 15% Weight Fraction of B4C+Fly Ash and Comparing With Th”. 2022. Journal of Pharmaceutical Negative Results, September, 438-49. https://doi.org/10.47750/pnr.2022.13.S04.048.