BERRúM, Rafael; CASTANO, Victor. Efficient manufacturing of automobile spark plugs : A six-sigma materials re-engineering case. International Journal of Engineering & Technology, [S. l.], v. 5, n. 3, p. 83–91, 2016. DOI: 10.14419/ijet.v5i3.5898. Disponível em: https://www.sciencepubco.com/index.php/ijet/article/view/5898.. Acesso em: 5 may. 2024.