DovgosheiA. A., and DordovskiiD. V. “Betweenness Relation and Isometric Imbeddings of Metric Spaces”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 10 (October 25, 2009): 1319-1328. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3103.