Amarishkumar J Patel and Sunilkumar N Chaudhari, “A Systematic Implementation of Six Sigma for Productivity Enhancement in Small-Scale Engineering Industries”, Int. J. Sci. Res. Mech. Mater. Eng, vol. 9, no. 5, pp. 28–43, Oct. 2025, doi: 10.32628/IJSRMME25955.