Existence results for positive solutions of a fractional boundary value problem involving a perturbation term. Letters in Nonlinear Analysis and its Applications, [S. l.], v. 2, n. 4, p. 200–207, 2024. Disponível em: https://lettersinnonlinearanalysis.com/index.php/lnaa/article/view/v2n4a42. Acesso em: 24 may. 2026.