MICHELETTI, A. M.; PISTOIA, A. A note on the resonance set for a semilinear elliptic equations and an application to jumping nonlinearities. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 1, p. 67–80, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.032. Acesso em: 5 jun. 2023.