VASSILIEV, V. A. On $r$-neighbourly submanifolds in $\mathbb R^N$. Topological Methods in Nonlinear Analysis, [S. l.], v. 11, n. 2, p. 273–281, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.018. Acesso em: 22 jul. 2024.