Sawalakhe, Pranil V., and Nitin P. Gudadhe. “Is Six Sigma an Appropriate Approach to Evaluate Performance of Testing Laboratories?”. Advanced Aspects of Engineering Research Vol. 8 (May 11, 2021): 160–166. Accessed June 13, 2026. https://stm.bookpi.org/AAER-V8/article/view/1110.