XIANG, Haifei. OSCILLATION OF THIRD-ORDER NONLINEAR NEUTRAL DIFFERENTIAL EQUATIONS WITH DISTRIBUTED TIME DELAY. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 36, p. 769–782, 2016. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6486. Acesso em: 16 aug. 2026.