FERRYANTO, Liem. DESIGN FOR SIX SIGMA. Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri, [S. l.], v. 9, n. 1, p. 1–14, 2007. DOI: 10.9744/jti.9.1.1-14. Disponível em: https://jurnalindustri.petra.ac.id/index.php/ind/article/view/16605. Acesso em: 4 oct. 2025.