BENCI, V.; MICHELETTI, A. M.; VISETTI, D. An eigenvalue problem for a quasilinear elliptic field equation on $\mathbb R^n$. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 2, p. 191–211, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.013. Acesso em: 22 jan. 2022.