Hieu, Nguyen Khac, Nguyen Thi Anh Van, Duan Khuu, and Thi My Hanh Nguyen. “Applying Lean Six Sigma Methodology to Improve Productivity: Case Study at a Mooncake Production Enterprise”. Management and Production Engineering Review 16, no. 2 (June 30, 2025): [nr art. 11], s. 1–10. Accessed September 20, 2026. https://wydawnictwo.pan.pl/index.php/mper/article/view/5636.