Oscillation of Nonlinear First Order Neutral Differential Equations. Baghdad Science Journal, Iraq, Baghdad, v. 4, n. 3, p. 485–490, 2007. DOI: 10.21123/bsj.2007.4.3.485-490. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/829.. Acesso em: 19 dec. 2024.