COFFMAN, A.; LEBL, J. Removing isolated zeroes by homotopy. Topological Methods in Nonlinear Analysis, [S. l.], v. 54, n. 1, p. 275–296, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.042. Acesso em: 18 lip. 2024.