Existence and uniqueness of solution and positive solution for a class of fractional boundary value problem. Letters in Nonlinear Analysis and its Applications, [S. l.], v. 1, n. 4, p. 182–190, 2023. DOI: 10.66147/lnaa.20231401. Disponível em: https://lettersinnonlinearanalysis.com/index.php/lnaa/article/view/v1n4a19. Acesso em: 13 jun. 2026.