PEJSACHOWICZ, J. Bifurcation of solutions of $U(1)$-equivariant semilinear boundary value problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 61, n. 1, p. 491–500, 2023. DOI: 10.12775/TMNA.2022.056. Disponível em: https://apcz.umk.pl/TMNA/article/view/42822. Acesso em: 22 jul. 2024.