LAVILLEDIEU, P.; SEEGER, A. Eigenvalue stability for multivalued operators. Topological Methods in Nonlinear Analysis, [S. l.], v. 15, n. 1, p. 115–128, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.009. Acesso em: 28 mar. 2024.