EVTUKHOV, V. M. On conditions for oscillation and nonoscillation of the solutions of a semilinear second-order differential equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 7, p. 833–841, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5674. Acesso em: 6 dec. 2025.