Oscillation criteria for nonlinear neutral hyperbolic equations with functional arguments . Neliniini Kolyvannya, [S. l.], v. 14, n. 1, p. 130–144, 2011. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/597. Acesso em: 21 jan. 2026.