“THE WORLD OF SIX SIGMA: SOLUTIONS TO UNSOLVABLE”. INTERNATIONAL JOURNAL OF ADVANCED RESEARCH IN MANAGEMENT (IJARM) 8, no. 3 (July 28, 2017): 15–26. Accessed June 17, 2026. https://openlibindex.com/index.php/IJARM/article/view/IJARM_08_03_003.