Oscillations of First Order Neutral Differential Equations with Positive and Negative Coefficients. Baghdad Science Journal, Iraq, Baghdad, v. 11, n. 4, p. 1624–1628, 2014. DOI: 10.21123/bsj.2014.11.4.1624-1628. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2058.. Acesso em: 20 dec. 2024.