MORRISON, G.; TAHERI, A. Topology of twists, extremising twist paths and multiple solutions to the nonlinear system in variation $\mathscr{L}[u] = \nabla \mathscr{P}$. Topological Methods in Nonlinear Analysis, [S. l.], v. 54, n. 2, p. 833–862, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.076. Acesso em: 18 jul. 2024.