“DMAIC SIX SIGMA APPROACH IN GOLD SCRAP/WASTE MANAGEMENT PROCEDURE FOR SMES JEWELLERY INDUSTRY”, Journal of Pharmaceutical Negative Results, pp. 5775–5782, Dec. 2022, Accessed: Jun. 16, 2026. [Online]. Available: https://www.pnrjournal.com/index.php/home/article/view/4757