Daletsky , A.Y. and Podkolzin , G.B. (1988) “Group approach to integration of the Todes infinite chain”, Ukrains’kyi Matematychnyi Zhurnal, 40(4), pp. 518–521. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/9190 (Accessed: 6 December 2025).