HE, J.-H. Application of topological technology to construction of a perturbation system for a strongly nonlinear equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 20, n. 1, p. 77–84, 2002. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2002.026. Acesso em: 23 apr. 2024.