Multiple solutions for a class BVPs for second order ODEs via an extension of Leray-Schauder boundary condition. Nonlinear Studies, [S. l.], v. 30, n. 1, 2023. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/2696. Acesso em: 17 oct. 2025.