SUNDAR SANTRA, Shyam. Necessary and sufficient conditions for oscillation of second-order differential equation with several delays. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 68, n. 2, p. 319–330, 2023. DOI: 10.24193/subbmath.2023.2.08. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/6003. Acesso em: 5 feb. 2025.