Protasov, I.V. (1994) “Two theorems on imbeddings of 0-dimensional groups”, Ukrains’kyi Matematychnyi Zhurnal, 46(11), pp. 1594–1596. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5603 (Accessed: 5 December 2025).