OGORODNIKOVA, S.; SADYRBAEV, F. Multiple solutions of nonlinear boundary value problems with oscillatory solutions. Mathematical Modelling and Analysis, [S. l.], v. 11, n. 4, p. 413–426, 2006. DOI: 10.3846/13926292.2006.9637328. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9650. Acesso em: 17 may. 2025.