Khusnu Milad M. Penerapan Metode Lean Six Sigma Dan Theory Of Inventive Problem Solving Untuk Mengurangi Waste Dan Perbaikan Kualitas Di PT. Unggul Makmur Sejahtera (PT.UMS) Lumajang. SYSTEMIC [Internet]. 2015 Dec. 1 [cited 2024 May 5];1(2):12-6. Available from: https://jurnalsaintek.uinsby.ac.id/index.php/SYSTEMIC/article/view/274