FIKRI, M.; PRAKASA HASIBUAN, R.; NELMA BUSRA; SARASWATI, D. Quality Control Analysis of Products Using the Six Sigma Method: A Case Study at PT. XYZ. Unified Systems Approach for Human centered Operations (USAHO), [S. l.], v. 1, n. 1, p. 1–16, 2026. Disponível em: https://gpijournal.com/index.php/usaho/article/view/652. Acesso em: 9 sep. 2026.