VALLES, A.; SANCHEZ, J.; NORIEGA, S.; NUÑEZ, B. G. Implementation of Six Sigma in a Manufacturing Process: A Case Study. International Journal of Industrial Engineering: Theory, Applications and Practice, [S. l.], v. 16, n. 3, p. 171–181, 2009. DOI: 10.23055/ijietap.2009.16.3.263. Disponível em: https://journals.sfu.ca/ijietap/index.php/ijie/article/view/263. Acesso em: 6 may. 2024.