ZITO, R. The Delta Variant. Journal of System Safety, [S. l.], v. 57, n. 3, p. 7–34, 2022. DOI: 10.56094/jss.v57i3.204. Disponível em: https://jsystemsafety.com/index.php/jss/article/view/204. Acesso em: 15 may. 2026.