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Indrianawati Usman and RIKARDO HUTASOIT (2019) Six Sigma DMAIC practice in cigarette production process: Challenges and Opportunity. In: International Conference of Organizational Innovation (ICOI 2019)., 20th-22nd July 2019, University of Ulsan, South Korea.
RIKARDO HUTASOIT (2017) PENERAPAN SIX SIGMA DMAIC DALAM MENURUNKAN DEFECT PADA PROSES PRODUKSI SIGARET (Studi Kasus di Koperasi XYZ). Thesis thesis, Universitas Airlangga.