QIONG, W.; MINGRUI, L. Research on Product Elements’ Safety-Critical Degree. Journal of System Safety, [S. l.], v. 51, n. 1, p. 21–23, 2015. DOI: 10.56094/jss.v51i1.171. Disponível em: https://jsystemsafety.com/index.php/jss/article/view/171. Acesso em: 4 jun. 2026.