PINTEA, Cornel. Some pairs of manifolds with infinite uncountable $\varphi$-category. Topological Methods in Nonlinear Analysis, [S. l.], v. 21, n. 1, p. 101–113, 2003. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2003.006. Acesso em: 8 jul. 2025.