On the existence of positive solutions for a ternary system of Riemann-Liouville type p-Laplacian fractional order boundary value problems. Nonlinear Studies, [S. l.], v. 27, n. 4, 2020. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/1848. Acesso em: 28 feb. 2026.