ZHU, Z.-Q.; CHENG, S. S. Asymptotically power solutions of higher order neutral functional differential equations. Tamkang Journal of Mathematics, [S. l.], v. 35, n. 4, p. 383–389, 2004. DOI: 10.5556/j.tkjm.35.2004.196. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/196. Acesso em: 5 jul. 2022.