Jihan Shofa M, Gunawan H. Implementasi Six Sigma untuk Perbaikan Produk Nickel Pig Iron. j. sist. manaj. ind. [Internet]. 2017Aug.5 [cited 2024Apr.25];1(1):29-4. Available from: https://e-jurnal.lppmunsera.org/index.php/JSMI/article/view/171