SERGEJEVA, N. On some fučík type problem with cubic nonlinearity. Mathematical Modelling and Analysis, [S. l.], v. 16, n. 1, p. 52–61, 2011. DOI: 10.3846/13926292.2011.559628. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/5507. Acesso em: 2 jun. 2025.