LI, J.-W.; CHENG, S. S. A priori bounds for periodic solutions of neutral differential equations with delay. Tamkang Journal of Mathematics, [S. l.], v. 38, n. 3, p. 239–246, 2007. DOI: 10.5556/j.tkjm.38.2007.76. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/76. Acesso em: 16 apr. 2024.