Mel’nik, V.L. (1998) “Topological classification of (n−1)-convex sets”, Ukrains’kyi Matematychnyi Zhurnal, 50(9), pp. 1236–1243. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4839 (Accessed: 6 December 2025).