Vassiliev, V. A. (1998) β€œOn $r$-neighbourly submanifolds in $\mathbb R^N$”, Topological Methods in Nonlinear Analysis, 11(2), pp. 273–281. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.018 (Accessed: 30 April 2024).