Oscillations of Second Order Impulsive Differential Equations with Advanced Arguments. Global Journal of Science Frontier Research, [S. l.], v. 18, n. F1, p. 25–32, 2018. Disponível em: https://testing.journalofscience.org/index.php/GJSFR/article/view/2155. Acesso em: 5 feb. 2026.