A Caputo-Type Fractional-Order SQIRV Mathematical Model for Omicron Variant. Contemporary Mathematics , [S. l.], v. 4, n. 4, p. 620–636, 2023. DOI: 10.37256/cm.4420232373. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/2373. Acesso em: 24 dec. 2025.