SMIRNOV, Sergey. On some spectral properties of third order nonlinear boundary value problems. Mathematical Modelling and Analysis, [S. l.], v. 17, n. 1, p. 78–89, 2012. DOI: 10.3846/13926292.2012.645076. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/4829. Acesso em: 9 may. 2025.