ISIFE, K. I. Positive solutions of a class of nonlinear boundary value fractional differential equations. Journal of Fractional Calculus and Nonlinear Systems, [S. l.], v. 2, n. 2, p. 78–92, 2021. DOI: 10.48185/jfcns.v2i2.353. Disponível em: https://sabapub.com/index.php/jfcns/article/view/353. Acesso em: 12 nov. 2025.