PRODUCT QUALITY IMPROVEMENT USING SIX SIGMA APPROACH IN YARN MAKING PROCESS IN PT. SUTRA COTTON TEXTILE INDUSTRIES SURABAYA. Tibuana : Journal of Applied Industrial Engineering, [S. l.], v. 3, n. 02, p. 1–11, 2020. DOI: 10.36456/tibuana.3.02.2558.1-11. Disponível em: https://jurnal.unipasby.ac.id/tibuana/article/view/2558. Acesso em: 4 jun. 2026.