FERREIRA, R. Generalized discrete operators. Journal of Fractional Calculus and Nonlinear Systems, [S. l.], v. 2, n. 1, p. 18–23, 2021. DOI: 10.48185/jfcns.v2i1.279. Disponível em: https://www.sabapub.com/index.php/jfcns/article/view/279. Acesso em: 16 apr. 2026.