Setyawan, S., and Supriyati. “Penurunan NG Flow Out & NG Ratio Menggunakan Metode Lean Six Sigma - DMAIC”. Prosiding Sains Dan Teknologi, vol. 3, no. 1, Feb. 2024, pp. 211-9, https://jurnal.pelitabangsa.ac.id/index.php/SAINTEK/article/view/3261.