XU, Z.; PENG, S. Interval criteria for oscillation of second order half-linear differential equations with damping. Tamkang Journal of Mathematics, [S. l.], v. 36, n. 1, p. 49-56, 2005. DOI: 10.5556/j.tkjm.36.2005.135. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/135. Acesso em: 26 may. 2022.