Bondar’E. A. (2013) “Semigroups of Strong Endomorphisms of Infinite Graphs and Hypergraphs”, Ukrains’kyi Matematychnyi Zhurnal, 65(6), pp. 743–754. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2459 (Accessed: 23November2024).