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PRODUCT QUALITY IMPROVEMENT USING SIX SIGMA APPROACH IN YARN MAKING PROCESS IN PT. SUTRA COTTON TEXTILE INDUSTRIES SURABAYA. Tibuana [Internet]. 2020 Jul. 29 [cited 2026 Aug. 24];3(02):1-11. Available from: https://jurnal.unipasby.ac.id/tibuana/article/view/2558