SANTOS, D. Beyond Six Sigma – A Control Chart for Tracking Defects per Billion Opportunities (dpbo). International Journal of Industrial Engineering: Theory, Applications and Practice, [S. l.], v. 16, n. 3, p. 227–233, 2009. DOI: 10.23055/ijietap.2009.16.3.268. Disponível em: https://ijietap.journals.publicknowledgeproject.org/index.php/ijie/article/view/268. Acesso em: 25 nov. 2024.