DOVGOSHEI, A. A.; DORDOVSKII, D. V. Betweenness relation and isometric imbeddings of metric spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 10, p. 1319–1328, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3103. Acesso em: 5 dec. 2025.