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: Information System and Informatics Journal, [S. l.], v. 1, n. 2, p. 12–16, 2015. DOI: 10.29080/systemic.v1i2.274. Disponível em: https://jurnalsaintek.uinsby.ac.id/index.php/SYSTEMIC/article/view/274. Acesso em: 5 may. 2024.