HIDALGO TORRES, J. L. Quality impact, with the use of more than three sigmas in the statistical control of processes by variables. Journal of business and entrepreneurial studie, [S. l.], v. 7, n. 3, 2023. DOI: 10.37956/jbes.v7i3.340. Disponível em: https://journalbusinesses.com/index.php/revista/article/view/340. Acesso em: 15 apr. 2026.