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Muhammad Farrel Apta Fedora. IMPROVING QUALITY IN ATM CARD PRODUCTION AT PT. DEF USING SIX SIGMA METHODOLOGY. IJEBAS [Internet]. 2025 Jan. 2 [cited 2025 Jan. 31];4(6):1847-55. Available from: https://radjapublika.com/index.php/IJEBAS/article/view/2263