LUO, Z.; SHEN, J. Oscillation criteria for differential equations with piecewise constant argument. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 4, p. 293–304, 2001. DOI: 10.5556/j.tkjm.32.2001.344. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/344. Acesso em: 29 mar. 2024.