Fractional derivatives as weighted average of historical values: an application to COVID-19 in Brazil. C.Q.D. - Revista Eletrônica Paulista de Matemática, Bauru, v. 22, n. 2, p. 275–284, 2022. DOI: 10.21167/cqdv22n22022275284. Disponível em: https://revistas.bauru.unesp.br/index.php/revistacqd/article/view/389. Acesso em: 6 nov. 2025.