The Impact of Multilateral Imported Cases of COVID-19 on the Epidemic Control in China. Communications in Mathematical Research, [S. l.], v. 36, n. 3, p. 320–335, 2020. DOI: 10.4208/cmr.2020-0017. Disponível em: https://global-sci.com/index.php/cmr/article/view/9035. Acesso em: 5 dec. 2025.