KOUNCHEV, O.; BOYADZHIEV, G.; SIMEONOV, G.; KUNCHEV, M.; KUNCHEVA, Z. Implementation of Hidden Infections in the SEIR Model Analysis of the Omicron Variant Spread in Bulgaria. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 76, n. 6, p. 953–961, 2023. DOI: 10.7546/CRABS.2023.06.16. Disponível em: https://www.proceedings.bas.bg/index.php/cr/article/view/339. Acesso em: 22 apr. 2026.