LIU, S. T.; CHENG, S. S. COMPARISON THEOREMS FOR A NONLINEAR THREE-TERM EQUATION. Tamkang Journal of Mathematics, [S. l.], v. 28, n. 4, p. 313–319, 1997. DOI: 10.5556/j.tkjm.28.1997.4309. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4309. Acesso em: 29 mar. 2024.