JIANCHU, J. Oscillation and nonoscillation theorems for second order nonlinear differential equations. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 2, p. 95–102, 2001. DOI: 10.5556/j.tkjm.32.2001.350. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/350. Acesso em: 25 apr. 2024.