ZHAO, Hanshuo. Application of Six Sigma Methods to Quality Improvement in Generator Sets. Global Academic Frontiers, Portland, Maine, v. 1, n. 1, p. 1–7, 2023. DOI: 10.5281/zenodo.11079372. Disponível em: https://gafj.org/journal/article/view/2.. Acesso em: 18 oct. 2024.